最近需要做一个将手机中保存的JSON文件转换成容易阅读的Excel文件，故做了一个小demo，现将该demo用到的一些部件记录一下。
1.文件浏览器
为了方便找到所需的JSON文件，故现做了一个简易的文件浏览器。
1.1文件列表
文件列表采用的是Android的空间ListView进行展示的，下面简要对ListView做一个简单的概述。
ListView的创建需要三个元素：
（1）ListView中的每一列的View。
（2）填入View的数据或者图片等。
（3）连接数据与ListView的适配器（Adapter）。
常用的ListView适配器有：ArrayAdapter<T>、SimpleAdatper、SimpleCursorAdapter、BaseAdapter。ArrayAdapter最为简单，ListView每一行只能展示一行字。SimpleAdapter有最好的扩充性，可以自定义出各种效果。SimpleCursorAdapter可以认为是SimpleAdapter对数据库的简单结合，可以方面的把数据库的内容以列表的形式展示出来。BaseAdapter是自定义适配器，使用它必须自定义类继承它，它可以实现更加多样的效果。
下面对ListView的使用做一个简单的描述：
（1）ListView资源视图的定义
<ListView
android:id="@+id/file_path_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:headerDividersEnabled="true"
android:footerDividersEnabled="true" android:fastScrollEnabled="true"/>
（2）ListView在Activity中创建
private ListView mListView = null;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mListView = (ListView)findViewById(R.id.file_path_list);
}
（3）各种Adapter的使用
（3.1）ArrayAdatper<T>使用
ArrayAdapter使用的资源视图 R.layout.simple_text.xml的定义
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="5dip"
android:paddingBottom="5dip"
android:orientation="horizontal"
android:gravity="center_vertical">
<TextView
android:id="@+id/file_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:singleLine="true"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
ArrayAdapter的使用
List<String> data = new ArrayList<String>();
data.add("数据1");
data.add("数据2");
mListView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_item,getData()));</span>
（3.2）SimpleAdapter、SimpleCursorAdapter使用
SimpleAdatper、SimpleCursorAdapter的使用步骤与ArrayAdapter是一样的，也是需要先定义好需要展示的View的xml，然后创建该Adapter的时候讲该xml的资源ID带人，同时填入数据，下面简单列一下SimpleCursorAdapter读取通讯录用于View展示的代码。
//读取通讯录
Cursor cursor = getContentResolver().query(People.CONTENT_URI, null, null, null, null);
startManagingCursor(cursor);
ListAdapter listAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_expandable_list_item_1, cursor,new String[]{People.NAME}, new int[]{android.R.id.text1});
mListView.setAdapter(listAdapter);
（3.3）BaseAdapter的使用
本次做的读取手机内存卡的文件浏览器采用的就是该适配器，现将代码贴在此：
文件列表每一项样式定义的xml文件：file_browser_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="5dip"
android:paddingBottom="5dip"
android:orientation="horizontal"
android:gravity="center_vertical">
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:gravity="center">
<ImageView
android:id="@+id/file_image_frame"
android:layout_width="65px"
android:layout_height="65px"
android:scaleType="centerInside"
android:gravity="center"
android:background="@drawable/image_icon_bg"
android:layout_gravity="center"
android:visibility="gone" />
<ImageView
android:id="@+id/file_image"
android:layout_width="59px"
android:layout_height="59px"
android:scaleType="centerInside"
android:gravity="center"
android:layout_gravity="center" />
</FrameLayout>
<LinearLayout
android:id="@+id/file_info_layout"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_gravity="center_vertical"
android:orientation="vertical"
android:paddingLeft="5dip">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/file_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:singleLine="true"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/file_count"
android:layout_width="wrap_content"
android:layout_marginLeft="5dip"
android:layout_height="wrap_content"
android:singleLine="true"
android:textAppearance="?android:attr/textAppearanceSmall" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/modified_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:gravity="left"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="@+id/file_size"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:layout_marginLeft="14px"
android:gravity="left"
android:textAppearance="?android:attr/textAppearanceSmall" />
</LinearLayout>
</LinearLayout>
<FrameLayout
android:id="@+id/file_checkbox_area"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:gravity="center"
android:paddingLeft="10dip">
<ImageView
android:id="@+id/file_checkbox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitCenter"
android:gravity="center"
android:layout_gravity="center" />
</FrameLayout>
</LinearLayout>
继承自BaseAdapter的类定义：
package com.szx.exportexcel;
import java.io.File;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import com.szx.util.Constant;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class FileListAdapter extends BaseAdapter {
private Context mcontext = null;
private List<File> mfiles = null;
public FileListAdapter(Context context,List<File> files){
mcontext = context;
mfiles = files;
}
@Override
public int getCount() {
int count = 0;
if(mfiles!=null){
count = mfiles.size();
}
return count;
}
@Override
public Object getItem(int position) {
if((position >= 0) && (position < this.getCount()))
return mfiles.get(position);
return null;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ListHolder mListHolder = null;
if(convertView==null){
convertView=LayoutInflater.from(mcontext).inflate(R.layout.file_browser_item, parent,false);
mListHolder = new ListHolder();
mListHolder.mfileIcon = (ImageView)convertView.findViewById(R.id.file_image);
mListHolder.mfileName = (TextView)convertView.findViewById(R.id.file_name);
mListHolder.mfileSize = (TextView)convertView.findViewById(R.id.file_size);
mListHolder.mfileTime = (TextView)convertView.findViewById(R.id.modified_time);
convertView.setTag(mListHolder);
}else{
mListHolder = (ListHolder)convertView.getTag();
}
File f = (File)this.getItem(position);
if(f!=null){
String fileIcon = Constant.getFileIcon(f);
if(fileIcon == null){
Drawable drawable = this.getApkIcon(f.getAbsolutePath());
if(drawable!=null){
mListHolder.mfileIcon.setImageDrawable(drawable);
}else{
mListHolder.mfileIcon.setImageResource(R.drawable.file_icon_default);
}
}else{
Resources res = mcontext.getResources();
int icon = res.getIdentifier(fileIcon, "drawable", mcontext.getPackageName());
if(icon<=0){
icon = R.drawable.file_icon_default;
}
mListHolder.mfileIcon.setImageResource(icon);
}
if(f.isFile()){
mListHolder.mfileName.setText(f.getName());
mListHolder.mfileSize.setText(this.getFileSize(f.length()));
}else{
File[] files = f.listFiles();
mListHolder.mfileSize.setText("");
if(files!=null){
mListHolder.mfileName.setText(f.getName()+"("+files.length+")");
}else{
mListHolder.mfileName.setText(f.getName());
}
}
mListHolder.mfileTime.setText(this.getFileTime(f.lastModified()));
}
return convertView;
}
public String getFileTime(long filetime) {
SimpleDateFormat formatter = new SimpleDateFormat ("yyyy-MM-dd hh:mm:ss");
String ftime = formatter.format(new Date(filetime));
return ftime;
}
public Drawable getApkIcon(String path){
PackageManager pm = mcontext.getPackageManager();
PackageInfo info = pm.getPackageArchiveInfo(path, PackageManager.GET_ACTIVITIES);
if(info != null){
ApplicationInfo appInfo = info.applicationInfo;
if(Build.VERSION.SDK_INT >= 8){
appInfo.sourceDir = path;
appInfo.publicSourceDir = path;
}
return appInfo.loadIcon(pm);
}
return null;
}
public String getFileSize(long filesize) {
DecimalFormat df = new DecimalFormat("#.00");
StringBuffer mstrbuf = new StringBuffer();
if (filesize < 1024) {
mstrbuf.append(filesize);
mstrbuf.append(" B");
} else if (filesize < 1048576) {
mstrbuf.append(df.format((double)filesize / 1024));
mstrbuf.append(" K");
} else if (filesize < 1073741824) {
mstrbuf.append(df.format((double)filesize / 1048576));
mstrbuf.append(" M");
} else {
mstrbuf.append(df.format((double)filesize / 1073741824));
mstrbuf.append(" G");
}
df = null;
return mstrbuf.toString();
}
static class ListHolder{
ImageView mfileIcon;
TextView mfileName;
TextView mfileSize;
TextView mfileTime;
}
}
自定义FileListAdapter的使用：
mFileListAdapter = new FileListAdapter(this,mFileList); mListView.setAdapter(mFileListAdapter); mFileListAdapter.notifyDataSetChanged();
继承自BaseAdapter的类必须实现如下几个函数：
@Override
public int getCount() {
// TODO Auto-generated method stub
return 0;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
return null;
}
其中getCount返回Adapter中有几条数据，getItem返回列表中位置为position的那一项，getView实现了整个列表中每一条样式的展现。
本demo的文件列表展示效果如下：
1.2ListView长按菜单的实现
ListView中长按菜单的实现由两种方式，一种是实现setOnItemLongClickListener事件，另外一种是通过上下文菜单实现。
（1）使用setOnItemLongClickListener实现
使用该方式实现需要自己实现弹出框的代码，本demo中采用上下文菜单方式实现。
mListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View v,
int pos, long id) {
return false;
}
});
（2）通过上下文菜单实现
（2.1）在OnCreate函数中给ListView注册上下文
registerForContextMenu(mListView);
（2.2）Activity实现onCreateContextMenu、onContextItemSelected两个方法
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.context_filemenu, menu);
AdapterView.AdapterContextMenuInfo info = null;
try {
info = (AdapterView.AdapterContextMenuInfo) menuInfo;
} catch (ClassCastException e) {
return;
}
File mselectedFile = (File)mFileListAdapter.getItem(info.position);
if(mselectedFile != null)
{
menu.setHeaderTitle(mselectedFile.getName());
}
}
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo)item.getMenuInfo();
File f = (File)mFileListAdapter.getItem(info.position);
if(f == null)
return false;
switch(item.getItemId()){
case R.id.exportExcel:
return true;
default:
return super.onContextItemSelected(item);
}
}
1.3SD卡路径文件的获取
（1）SD卡路径的获取
File f = null;
boolean sdCardExist = Environment.getExternalStorageState()
.equals(Environment.MEDIA_MOUNTED); //判断sd卡是否存在
if (sdCardExist)
{
f = Environment.getExternalStorageDirectory();//获取sd卡目录
if (f != null) {
mSDCardPath = f.getAbsolutePath();
}
f = Environment.getRootDirectory();//获取根目录
if (f != null) {
mRootPath = f.getAbsolutePath();
}
}
（2）SD卡文件的获取及展示
File file = null;
if(mCurrentPathFile!=null){
if(mCurrentPathFile.isDirectory()){
file = mCurrentPathFile;
}else{
file = mCurrentPathFile.getParentFile();
}
}else{
file = new File(mSDCardPath);
}
if(file!=null){
if(file.exists()&&file.canRead()){
if(file.isFile()){
}else{
mFileList.clear();
mFileListAdapter.notifyDataSetChanged();
mCurrentPathFile = file;
mCurrentPathView.setText(mCurrentPathFile.getAbsolutePath());
File[] files = file.listFiles();
Arrays.sort(files,new FileComparator());
for(File f:files){
mFileList.add(f);
mFileListAdapter.notifyDataSetChanged();
}
}
}
}
2.JSON字符串转换成HashMap
JSON解析的库有三种：Android自带的JSON解析库，net.sf.json库，gson库。其中Android自带的JSON库使用起来不方便，net.sf.json库使用的Jar包与Android的包冲突，故Android中普遍使用gson来进行JSON的解析。
下面是从网上摘录的使用gson转换JSON串为Map的工具类
package com.szx.util;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
/**
* 使用Gson把json字符串转成Map
*/
public class JSONUtil {
/**
* 获取JsonObject
* @param json
* @return
*/
public static JsonObject parseJson(String json){
JsonParser parser = new JsonParser();
JsonObject jsonObj = parser.parse(json).getAsJsonObject();
return jsonObj;
}
/**
* 根据json字符串返回Map对象
* @param json
* @return
*/
public static Map<String,Object> toMap(String json){
return JSONUtil.toMap(JSONUtil.parseJson(json));
}
/**
* 将JSONObjec对象转换成Map-List集合
* @param json
* @return
*/
public static Map<String, Object> toMap(JsonObject json){
Map<String, Object> map = new HashMap<String, Object>();
Set<Entry<String, JsonElement>> entrySet = json.entrySet();
for (Iterator<Entry<String, JsonElement>> iter = entrySet.iterator(); iter.hasNext(); ){
Entry<String, JsonElement> entry = iter.next();
String key = entry.getKey();
Object value = entry.getValue();
if(value instanceof JsonArray)
map.put((String) key, toList((JsonArray) value));
else if(value instanceof JsonObject)
map.put((String) key, toMap((JsonObject) value));
else
map.put((String) key, value);
}
return map;
}
/**
* 将JSONArray对象转换成List集合
* @param json
* @return
*/
public static List<Object> toList(JsonArray json){
List<Object> list = new ArrayList<Object>();
for (int i=0; i<json.size(); i++){
Object value = json.get(i);
if(value instanceof JsonArray){
list.add(toList((JsonArray) value));
}
else if(value instanceof JsonObject){
list.add(toMap((JsonObject) value));
}
else{
list.add(value);
}
}
return list;
}
}
虽然net.sf.json与Android冲突，但是使用它转JSON串的工具类在其他地方用处也很大，故也记录与此。
net.sf.json使用的jar文件如图：
工具类如下：
package com.szx.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import net.sf.json.JSONArray;
import net.sf.json.JSONException;
import net.sf.json.JSONObject;
import android.content.Context;
public class JSONUtil {
public static String getRaw(Context context, int RawId) {
try {
InputStream is = context.getResources().openRawResource(RawId);
BufferedReader reader = new BufferedReader(
new InputStreamReader(is));
// StringBuffer线程安全；StringBuilder线程不安全
StringBuffer sb = new StringBuffer();
for (String str = null; (str = reader.readLine()) != null;) {
sb.append(str);
}
return sb.toString();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public static String getAsset(Context context, String fileName) {
try {
InputStream is = context.getResources().getAssets().open(fileName);
// StringBuffer线程安全；StringBuilder线程不安全
BufferedReader reader = new BufferedReader(
new InputStreamReader(is));
StringBuffer sb = new StringBuffer();
for (String str = null; (str = reader.readLine()) != null;) {
sb.append(str);
}
return sb.toString();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public static void JsonObject2HashMap(JSONObject jo, List<Map<?, ?>> rstList) {
for (Iterator<String> keys = jo.keys(); keys.hasNext();) {
try {
String key1 = keys.next();
System.out.println("key1---" + key1 + "------" + jo.get(key1)
+ (jo.get(key1) instanceof JSONObject) + jo.get(key1)
+ (jo.get(key1) instanceof JSONArray));
if (jo.get(key1) instanceof JSONObject) {
JsonObject2HashMap((JSONObject) jo.get(key1), rstList);
continue;
}
if (jo.get(key1) instanceof JSONArray) {
JsonArray2HashMap((JSONArray) jo.get(key1), rstList);
continue;
}
System.out.println("key1:" + key1 + "----------jo.get(key1):"
+ jo.get(key1));
json2HashMap(key1, jo.get(key1), rstList);
} catch (Exception e) {
e.printStackTrace();
}
}
}
public static void JsonArray2HashMap(JSONArray joArr,
List<Map<?, ?>> rstList) {
for (int i = 0; i < joArr.size(); i++) {
try {
if (joArr.get(i) instanceof JSONObject) {
JsonObject2HashMap((JSONObject) joArr.get(i), rstList);
continue;
}
if (joArr.get(i) instanceof JSONArray) {
JsonArray2HashMap((JSONArray) joArr.get(i), rstList);
continue;
}
System.out.println("Excepton~~~~~");
} catch (Exception e) {
e.printStackTrace();
}
}
}
public static void json2HashMap(String key, Object value,
List<Map<?, ?>> rstList) {
HashMap<String, Object> map = new HashMap<String, Object>();
map.put(key, value);
rstList.add(map);
}
/**
* @param jsonData
* @param rstList
* @param params
* @func hashmap追加字段
*/
public static void JsonToHashMap(JSONObject jsonData, Map<String, Object> rstList,
String... params) {
try {
for (Iterator<String> keyStr = jsonData.keys(); keyStr.hasNext();) {
String key1 = keyStr.next().trim();
if (jsonData.get(key1) instanceof JSONObject) {
HashMap<String, Object> mapObj = new HashMap<String, Object>();
JsonToHashMap((JSONObject) jsonData.get(key1), mapObj, params);
rstList.put(key1, mapObj);
continue;
}
if (jsonData.get(key1) instanceof JSONArray) {
ArrayList<Map<String, Object>> arrayList = new ArrayList<Map<String, Object>>();
JsonToHashMap((JSONArray) jsonData.get(key1), arrayList, params);
rstList.put(key1, arrayList);
continue;
}
JsonToHashMap(key1, jsonData.get(key1), rstList);
}
// 追加字段
if (params != null && params.length == 2) {
rstList.put(params[0], params[1]);
}
if (params != null && params.length == 4) {
rstList.put(params[0], params[1]);
rstList.put(params[2], params[3]);
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static void JsonToHashMap(JSONArray jsonarray, List<Map<String, Object>> rstList,
String... params) {
try {
for (int i = 0; i < jsonarray.size(); i++) {
if (jsonarray.get(i) instanceof JSONObject) {
HashMap<String, Object> mapObj = new HashMap<String, Object>();
JsonToHashMap((JSONObject) jsonarray.get(i), mapObj, params);
rstList.add(mapObj);
continue;
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static void JsonToHashMap(String key, Object value, Map<String, Object> rstList) {
key = replaceBlank(key);
if (value instanceof String) {
rstList.put(key, replaceBlank((String) value));
return;
}
rstList.put(key, value);
}
public static String replaceBlank(String str) {
String dest = "";
if (str != null) {
Pattern p = Pattern.compile("\\s*|t|r|n");
Matcher m = p.matcher(str);
dest = m.replaceAll("");
}
return dest;
}
}
3.导出Excel
Android中导出excel使用的类库是jxl，下面是使用jxl.jar实现的导出excel的类
package com.szx.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import android.content.Context;
import android.util.Log;
import android.widget.Toast;
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.WorkbookSettings;
import jxl.write.Label;
import jxl.write.WritableCell;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
public class ExcelUtils {
public static WritableFont arial14font = null;
public static WritableCellFormat arial14format = null;
public static WritableFont arial10font = null;
public static WritableCellFormat arial10format = null;
public static WritableFont arial12font = null;
public static WritableCellFormat arial12format = null;
public final static String UTF8_ENCODING = "UTF-8";
public final static String GBK_ENCODING = "GBK";
public static void format() {
try {
arial14font = new WritableFont(WritableFont.ARIAL, 14,
WritableFont.BOLD);
arial14font.setColour(jxl.format.Colour.LIGHT_BLUE);
arial14format = new WritableCellFormat(arial14font);
arial14format.setAlignment(jxl.format.Alignment.CENTRE);
arial14format.setVerticalAlignment(jxl.format.VerticalAlignment.CENTRE);
arial14format.setBorder(jxl.format.Border.ALL,
jxl.format.BorderLineStyle.THIN);
arial14format.setBackground(jxl.format.Colour.VERY_LIGHT_YELLOW);
arial10font = new WritableFont(WritableFont.ARIAL, 10,
WritableFont.BOLD);
arial10format = new WritableCellFormat(arial10font);
arial10format.setAlignment(jxl.format.Alignment.CENTRE);
arial10format.setBorder(jxl.format.Border.ALL,
jxl.format.BorderLineStyle.THIN);
arial10format.setBackground(jxl.format.Colour.LIGHT_BLUE);
arial12font = new WritableFont(WritableFont.ARIAL, 12);
arial12format = new WritableCellFormat(arial12font);
arial12format.setBorder(jxl.format.Border.ALL,
jxl.format.BorderLineStyle.THIN);
} catch (WriteException e) {
e.printStackTrace();
}
}
public static void createSmtrautExcel(String fileName,String sheetName,String[] lineName,String[] colName,List<List<Map<String,Object>>>values){
format();
WritableWorkbook workbook = null;
try {
File file = new File(fileName);
if (!file.exists()) {
file.createNewFile();
}
boolean isWrite = file.canWrite();
workbook = Workbook.createWorkbook(file);
WritableSheet sheet = workbook.createSheet(sheetName, 0);
int ran = 1;
for(int j=0;j<values.size();j++){
sheet.setRowView(j*6+ran-1, 600);
for (int line = 0; line < lineName.length; line++) {
sheet.addCell(new Label(line+1, j*6+ran, lineName[line], arial10format));
}
for (int col = 0; col < colName.length; col++) {
sheet.addCell(new Label(0, col+j*6+ran+1, colName[col], arial10format));
}
for(int i=0;i<values.get(j).size();i++){
Map<String,Object> m = values.get(j).get(i);
int col = (Integer) m.get("col");
int line = (Integer)m.get("line");
String value = (String)m.get("value");
if(col==0&&line==0){
sheet.addCell(new Label(col,line+j*6+ran-1, value, arial14format));
sheet.addCell(new Label(col,line+j*6+ran, "", arial10format));
sheet.mergeCells(col, line+j*6+ran-1, col+lineName.length, line+j*6+ran-1);
}else{
sheet.addCell(new Label(col,line+j*6+ran, value, arial10format));
}
}
ran++;
}
workbook.write();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (workbook != null) {
try {
workbook.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
使用jxl进行导出excel导出文件，简单说几点：
（1）创建excel：WritableWorkbook
workbook = Workbook.createWorkbook(file);
（2）创建sheet：WritableSheet
sheet = workbook.createSheet(sheetName, 0);
（3）写入单元格数据：sheet.addCell(new
Label(col,line+j*6+ran, value, arial10format));其中Label中第一个参数是列，第二个参数是行，第三个参数是写入单元格中的值，第四个参数是单元格的样式
（4）设置行高：sheet.setRowView(j*6+ran-1,
600);其中第一个参数是行号，第二个参数是行高
（5）合并单元格：sheet.mergeCells(col,
line+j*6+ran-1, col+lineName.length, line+j*6+ran-1);其中第一个参数是合并单元格左上角的列号，第二个参数是左上角的行号，第三个参数是右下角的列号，第四个参数是右下角的行号。
上述即是该demo中使用的技术点，该demo可从该处下载。
该demo实现了如下JSON串：
{"acc_ffz":1.6,"acc_fz":0.8,"acc_yxz":0.6,"bulk_mathValue":-1.0,"dis_ffz":10.8,"dis_fz":5.4,"dis_yxz":3.8,"en_ffz":1.4,"en_fz":0.7,"en_yxz":0.5,"sample_time":"2016-09-09T03:15:25.313+0000","signalType":-1,"tmp":41.2,"vel_ffz":1.1,"vel_fz":0.6,"vel_yxz":0.4}
转换成该改格式的excel表：
时间： 2024-11-03 05:23:07