工作中有时会遇到各种需求，你得变着法儿去解决，当然重要的是在什么场景中去完成。
比如Strut2中file类型如何转换成multipartfile类型，找了几天，发现一个变通的方法记录如下（虽然最后没有用上。。）：
1 private static MultipartFile getMulFileByPath(String picPath) {
2
3 FileItem fileItem = createFileItem(picPath);
4
5 MultipartFile mfile = new CommonsMultipartFile(fileItem);
6
7 return mfile;
8
9 }
10
11
12
13 private static FileItem createFileItem(String filePath)
14
15 {
16
17 FileItemFactory factory = new DiskFileItemFactory(16, null);
18
19 String textFieldName = "textField";
20
21 int num = filePath.lastIndexOf(".");
22
23 String extFile = filePath.substring(num);
24
25 FileItem item = factory.createItem(textFieldName, "text/plain", true,
26
27 "MyFileName" + extFile);
28
29 File newfile = new File(filePath);
30
31 int bytesRead = 0;
32
33 byte[] buffer = new byte[4096];
34
35 try
36
37 {
38
39 FileInputStream fis = new FileInputStream(newfile);
40
41 OutputStream os = item.getOutputStream();
42
43 while ((bytesRead = fis.read(buffer, 0, 8192))
44
45 != -1)
46
47 {
48
49 os.write(buffer, 0, bytesRead);
50
51 }
52
53 os.close();
54
55 fis.close();
56
57 }
58
59 catch (IOException e)
60
61 {
62
63 e.printStackTrace();
64
65 }
66
67 return item;
68
69 }
file2multipartfile
好不容易写好了一个完整的远程上传方法，并且本地测试已经通过能用，提交后发现有个类实例化不了，debug发现是包不兼容问题（尴尬），
但是以前别人用过的东西，你又不能升级，主要是没权限，不得不去低级的版本中找变通的类似方法，即便方法已经过时了。。
//httpclient(4.5.3)远程传输文件工具类
1 public static Map<String, String> executeDriverServer(String driverUrl, Map<String, Object> param,String multipart, String contentType,int timeout,String picPath) throws Exception {
2
3 String res = ""; // 请求返回默认的支持json串
4
5 Map<String, String> map = new HashMap<String, String>();
6 ContentType ctype = ContentType.create("content-disposition","UTF-8");
7
8 Map<String, String> map = new HashMap<String, String>();
9
10 HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
11
12 CloseableHttpClient closeableHttpClient = httpClientBuilder.build();
13
14 String res = ""; // 请求返回默认的支持json串
15
16 HttpResponse httpResponse = null;
17
18 try {
19
20 HttpPost httpPost = new HttpPost(driverUrl);
21
22 //设置请求和传输超时时间
23
24 RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(timeout).setConnectTimeout(5000).build();
25
26 httpPost.setConfig(requestConfig);
27
28 // BTW 4.3版本不设置超时的话,一旦服务器没有响应,等待时间N久(>24小时)。
29
30 if(httpPost!=null){
31
32 if("formdata".equals(multipart)){
33
34 MultipartEntityBuilder mentity = MultipartEntityBuilder.create().setMode(HttpMultipartMode.RFC6532);
35
36 Set<String> keyset = param.keySet();
37
38 for (String key : keyset) {
39
40 Object paramObj = Validate.notNull(param.get(key));
41
42 if(paramObj instanceof MultipartFile) {
43
44 mentity.addBinaryBody(key, ((MultipartFile) paramObj).getInputStream(),ctype,((MultipartFile) paramObj).getOriginalFilename());
45
46 }else if(paramObj instanceof File){
47
48 mentity.addBinaryBody(key, (File)paramObj);//(key, new FileInputStream((File)paramObj),ctype,((File)paramObj).getName());
49
50 }else{
51
52 mentity.addPart(key,new StringBody(paramObj.toString(),ctype));
53
54 //mentity.addTextBody(key,paramObj.toString());
55
56 }
57
58 logger.info("key::::"+key);
59
60 logger.info("paramObj::::"+paramObj.toString());
61
62 }
63
64 HttpEntity entity = mentity.build();
65
66 HttpUriRequest post = RequestBuilder.post().setUri(driverUrl).setEntity(entity).build();
67
68 httpResponse = closeableHttpClient.execute(post);
69
70 }else {
71
72 HttpEntity entity = convertParam(param, contentType);
73
74 httpPost.setEntity(entity);
75
76 httpResponse = closeableHttpClient.execute(httpPost);
77
78 }
79
80 if(httpResponse == null) {
81
82 throw new Exception("无返回结果");
83
84 }
85
86 // 获取返回的状态码
87
88 int status = httpResponse.getStatusLine().getStatusCode();
89
90 logger.info("Post请求URL="+driverUrl+",请求的参数="+param.toString()+",请求的格式"+contentType+",状态="+status);
91
92 if(status == HttpStatus.SC_OK){
93
94 HttpEntity entity2 = httpResponse.getEntity();
95
96 InputStream ins = entity2.getContent();
97
98 res = toString(ins);
99
100 ins.close();
101
102 }else{
103
104 InputStream fis = httpResponse.getEntity().getContent();
105
106 Scanner sc = new Scanner(fis);
107
108 logger.info("Scanner:::::"+sc.next());
109
110 logger.error("Post请求URL="+driverUrl+",请求的参数="+param.toString()+",请求的格式"+contentType+",错误Code:"+status);
111
112 }
113
114 map.put("code", String.valueOf(status));
115
116 map.put("result", res);
117
118 logger.info("执行Post方法请求返回的结果 = " + res);
119
120 }
121
122 } catch (ClientProtocolException e) {
123
124 map.put("code", HttpClientUtil.CLIENT_PROTOCOL_EXCEPTION_STATUS);
125
126 map.put("result", e.getMessage());
127
128 } catch (UnsupportedEncodingException e) {
129
130 map.put("code", HttpClientUtil.UNSUPPORTED_ENCODING_EXCEPTION_STATUS);
131
132 map.put("result", e.getMessage());
133
134 } catch (IOException e) {
135
136 map.put("code", HttpClientUtil.IO_EXCEPTION_STATUS);
137
138 map.put("result", e.getMessage());
139
140 } finally {
141
142 try {
143
144 closeableHttpClient.close();
145
146 } catch (IOException e) {
147
148 logger.error("调用httpClient出错", e);
149
150 throw new Exception("调用httpClient出错", e);
151
152 }
153
154 }
155
156
157
158 private static String toString(InputStream in) throws IOException{
159
160 ByteArrayOutputStream os = new ByteArrayOutputStream();
161
162 byte[] b = new byte[1024];
163
164 int len;
165
166 while((len = in.read(b)) != -1) {
167
168 os.write(b, 0, len);
169
170 }
171
172 return os.toString("UTF-8");
173
174 }
175 }
4.53包下http远程文件上传
//httpclient(4.2.2)老版本远程传输文件工具类
1 public static Map<String, String> executeDriverServer(String driverUrl, Map<String, Object> param,String multipart, String contentType,int timeout,String picPath) throws Exception {
2
3 String res = ""; // 请求返回默认的支持json串
4
5 Map<String, String> map = new HashMap<String, String>();
6
7 ContentType ctype = ContentType.create("content-disposition","UTF-8");
8
9 HttpPost httpPost = new HttpPost(driverUrl);
10
11 MultipartEntity reqEntity = new MultipartEntity();
12
13 Set<String> keyset = param.keySet();
14
15 File tempFile = new File(picPath);
16
17 for (String key : keyset) {
18
19 Object paramObj = Validate.notNull(param.get(key));
20
21 if(paramObj instanceof File) {
22
23 FileBody fileBody = new FileBody(tempFile);
24
25 reqEntity.addPart(key, fileBody);
26
27 }else{
28
29 reqEntity.addPart(key,new StringBody(paramObj.toString()));
30
31 }
32
33 logger.info("key::::"+key);
34
35 logger.info("paramObj::::"+paramObj.toString());
36
37 }
38
39 httpPost.setEntity(reqEntity);
40
41 HttpClient httpClient = new DefaultHttpClient();
42
43 HttpResponse httpResponse = httpClient.execute(httpPost);
44
45 // 获取返回的状态码
46
47 int status = httpResponse.getStatusLine().getStatusCode();
48
49 logger.info("Post请求URL="+driverUrl+",请求的参数="+param.toString()+",请求的格式"+contentType+",状态="+status);
50
51 if(status == HttpStatus.SC_OK){
52
53 HttpEntity entity2 = httpResponse.getEntity();
54
55 InputStream ins = entity2.getContent();
56
57 res = toString(ins);
58
59 ins.close();
60
61 }else{
62
63 InputStream fis = httpResponse.getEntity().getContent();
64
65 Scanner sc = new Scanner(fis);
66
67 logger.info("Scanner:::::"+sc.next());
68
69 logger.error("Post请求URL="+driverUrl+",请求的参数="+param.toString()+",请求的格式"+contentType+",错误Code:"+status);
70
71 }
72
73 map.put("code", String.valueOf(status));
74
75 map.put("result", res);
76
77 logger.info("执行Post方法请求返回的结果 = " + res);
78
79 return map;
80
81 }
4.2.2版本http远程传输文件工具类
希望对大家有点帮助！平常心。
原文地址：https://www.cnblogs.com/lq147760524/p/9349959.html
时间： 2024-08-29 01:56:39