JSON字符串转换JAVA对象例子。

1. package com.demo.json;
2. import java.util.ArrayList;
3. import java.util.HashMap;
4. import java.util.List;
5. import java.util.Map;
6. import net.sf.json.JSONArray;
7. import net.sf.json.JSONObject;
8. import org.json.simple.JSONValue;
9. public class JsonTest
10. {
11. public static void main(String[] args)
12. {
13. // -----------------------------------------------------------------------------
14. // Object 2 JSON
15. List<Peoper> peopers = new ArrayList<Peoper>();
16. Peoper p1 = new Peoper("001", "Taki", "中国");
17. Peoper p2 = new Peoper("002", "DSM", "China");
18. peopers.add(p1);
19. peopers.add(p2);
20. String result = JsonTool.getJsonString("Peopers", peopers);
21. System.out.println("JSON: " + result);
22. // 解析PHP json_encode 字符串
23. String jsonStr = "{\"Name\":\"\u5e0c\u4e9a\",\"Age\":20}";
24. Object obj = JSONValue.parse(jsonStr);
25. System.out.println(obj);
26. System.out.println();
27. // -----------------------------------------------------------------------------
28. // JSON 2 Object
29. String jsonString = "["
30. + "{\"author\":\"7\",\"id\":358,\"title\":\"Japan\",\"pictures\":[{\"description\":\"001\",\"imgPath\":\"/cms/u/cms/www/201203/05150720ii68.jpg\"},{\"description\":\"002\",\"imgPath\":\"/cms/u/cms/www/201203/05150720ii67.jpg\"}],\"path\":\"ip\"},"
31. + "{\"author\":\"8\",\"id\":359,\"title\":\"China\",\"pictures\":[{\"description\":\"101\",\"imgPath\":\"/cms/u/cms/www/201203/111111111111.jpg\"},{\"description\":\"102\",\"imgPath\":\"/cms/u/cms/www/201203/222222222222.jpg\"}],\"path\":\"ip\"}]";
32. JSONArray array = JSONArray.fromObject(jsonString);
33. // Content.class包含pictures.class,需要设置这个参数
34. Map<String, Class<pictures>> classMap = new HashMap<String, Class<pictures>>();
35. classMap.put("pictures", pictures.class);
36. Object[] objs = new Object[array.size()];
37. for (int i = 0; i < array.size(); i++)
38. {
39. JSONObject jsonObject = array.getJSONObject(i);
40. objs[i] = (Content) JSONObject.toBean(jsonObject, Content.class, classMap);
41. }
42. // 转换Content,循环输出所有content
43. for (int i = 0; i < objs.length; i++)
44. {
45. Content content = (Content) objs[i];
46. System.out.println("author:" + content.getAuthor() + " ID:"
47. + content.getId() + " Title:" + content.getTitle() + " Path:" + content.getPath());
48. // 转换pictures,循环输出所有picture
49. List<pictures> pictures = content.getPictures();
50. for (int n = 0; n < pictures.size(); n++)
51. System.out.println("description:"
52. + pictures.get(n).getDescription() + " imgPath:" + pictures.get(n).getImgPath());
53. }
54. }
55. }

JsonTool:

[java] view plain

1. package com.demo.json;
2. import java.util.regex.Matcher;
3. import java.util.regex.Pattern;
4. import net.sf.json.JSONObject;
5. public class JsonTool
6. {
7. public static String getJsonString(Object key, Object value)
8. {
9. //System.out.println("key: " + key);
10. //System.out.println("value: " + value.toString());
11. JSONObject obj = new JSONObject();
12. obj.put(key, value);    //添加物件
13. return obj.toString();  //转换为字符串并返回
14. }
15. //解析PHP json_encode 字符串
16. public static String unescapeUnicode(String str)
17. {
18. StringBuffer b=new StringBuffer();
19. Matcher m = Pattern.compile("\\\\u([0-9a-fA-F]{4})").matcher(str);
20. while(m.find())
21. {
22. b.append((char)Integer.parseInt(m.group(1),16));
23. }
24. return b.toString();
25. }
26. }

People:

[java] view plain

1. package com.demo.json;
2. public class People
3. {
4. public People()
5. {
6. }
7. public People(String id, String name, String address)
8. {
9. this.id = id;
10. this.name = name;
11. this.address = address;
12. }
13. private String id;
14. private String name;
15. private String address;
16. public String getId() {
17. return id;
18. }
19. public void setId(String id) {
20. this.id = id;
21. }
22. public String getName() {
23. return name;
24. }
25. public void setName(String name) {
26. this.name = name;
27. }
28. public String getAddress() {
29. return address;
30. }
31. public void setAddress(String address) {
32. this.address = address;
33. }
34. public String toString()
35. {
36. return "ID:" + this.id + " Name:" + this.name + " Address:" + this.address;
37. }
38. }

Content:

[java] view plain

1. package com.demo.json;
2. import java.util.List;
3. public class Content {
4. private String author;
5. private String id;
6. private String title;
7. private List<pictures> pictures;
8. private String path;
9. public String getAuthor() {
10. return author;
11. }
12. public void setAuthor(String author) {
13. this.author = author;
14. }
15. public String getId() {
16. return id;
17. }
18. public void setId(String id) {
19. this.id = id;
20. }
21. public String getTitle() {
22. return title;
23. }
24. public void setTitle(String title) {
25. this.title = title;
26. }
27. public List<pictures> getPictures() {
28. return pictures;
29. }
30. public void setPictures(List<pictures> pictures) {
31. this.pictures = pictures;
32. }
33. public String getPath() {
34. return path;
35. }
36. public void setPath(String path) {
37. this.path = path;
38. }
39. }

pictures:

[java] view plain

1. package com.demo.json;
2. public class pictures {
3. private String description;
4. private String imgPath;
5. public String getDescription() {
6. return description;
7. }
8. public void setDescription(String description) {
9. this.description = description;
10. }
11. public String getImgPath() {
12. return imgPath;
13. }
14. public void setImgPath(String imgPath) {
15. this.imgPath = imgPath;
16. }
17. }

控制台运行结果：

[plain] view plain

1. JSON: {"Peopers":[{"address":"中国","id":"001","name":"Taki"},{"address":"Japan","id":"002","name":"DSM"}]}
2. {"Name":"中文内容","Age":20}
3. author:7 ID:358 Title:Japan Path:ip
4. description:001 imgPath:/cms/u/cms/www/201203/05150720ii68.jpg
5. description:002 imgPath:/cms/u/cms/www/201203/05150720ii67.jpg
6. author:8 ID:359 Title:China Path:ip
7. description:101 imgPath:/cms/u/cms/www/201203/111111111111.jpg
8. description:102 imgPath:/cms/u/cms/www/201203/222222222222.jpg