struts文件上传

 1 public String intercept(ActionInvocation invocation) throws Exception {
 2     ActionContext ac = invocation.getInvocationContext();
 3 
 4     HttpServletRequest request = (HttpServletRequest) ac.get(ServletActionContext.HTTP_REQUEST);
 5 
 6     if (!(request instanceof MultiPartRequestWrapper)) {
 7         if (LOG.isDebugEnabled()) {
 8             ActionProxy proxy = invocation.getProxy();
 9             LOG.debug(getTextMessage("struts.messages.bypass.request", new String[]{proxy.getNamespace(), proxy.getActionName()}));
10         }
11 
12         return invocation.invoke();
13     }
14 
15     ValidationAware validation = null;
16 
17     Object action = invocation.getAction();
18 
19     if (action instanceof ValidationAware) {
20         validation = (ValidationAware) action;
21     }
22 
23     MultiPartRequestWrapper multiWrapper = (MultiPartRequestWrapper) request;
24 
25     if (multiWrapper.hasErrors()) {
26         for (String error : multiWrapper.getErrors()) {
27             if (validation != null) {
28                 validation.addActionError(error);
29             }
30         }
31     }
32 
33     // bind allowed Files===核心处理代码逻辑
34     //大体逻辑
35     //循环遍历前台input标签定义的name列表，每个name对应一个文件列表，遍历文件列表获取文件类型及文件内容
36     Enumeration fileParameterNames = multiWrapper.getFileParameterNames();
37     while (fileParameterNames != null && fileParameterNames.hasMoreElements()) {
38         // get the value of this input tag获取前台定义的name属性
39         String inputName = (String) fileParameterNames.nextElement();
40 
41         // get the content type==获取文件类型
42         String[] contentType = multiWrapper.getContentTypes(inputName);
43 
44         if (isNonEmpty(contentType)) {
45             // get the name of the file from the input tag==获取文件名
46             String[] fileName = multiWrapper.getFileNames(inputName);
47 
48             if (isNonEmpty(fileName)) {
49                 // get a File object for the uploaded File
50                 File[] files = multiWrapper.getFiles(inputName);
51                 if (files != null && files.length > 0) {
52                     List<File> acceptedFiles = new ArrayList<File>(files.length);
53                     List<String> acceptedContentTypes = new ArrayList<String>(files.length);
54                     List<String> acceptedFileNames = new ArrayList<String>(files.length);
55                     String contentTypeName = inputName + "ContentType";
56                     String fileNameName = inputName + "FileName";
57 
58                     for (int index = 0; index < files.length; index++) {
59                         if (acceptFile(action, files[index], fileName[index], contentType[index], inputName, validation)) {
60                             acceptedFiles.add(files[index]);
61                             acceptedContentTypes.add(contentType[index]);
62                             acceptedFileNames.add(fileName[index]);
63                         }
64                     }
65 
66                     if (!acceptedFiles.isEmpty()) {
67                         Map<String, Object> params = ac.getParameters();
68 //文件列表
69                         params.put(inputName, acceptedFiles.toArray(new File[acceptedFiles.size()]));
70 //文件类型名称列表
71                         params.put(contentTypeName, acceptedContentTypes.toArray(new String[acceptedContentTypes.size()]));
72 //文件名称列表
73                         params.put(fileNameName, acceptedFileNames.toArray(new String[acceptedFileNames.size()]));
74                     }
75                 }
76             } else {
77                 if (LOG.isWarnEnabled()) {
78                     LOG.warn(getTextMessage(action, "struts.messages.invalid.file", new String[]{inputName}));
79                 }
80             }
81         } else {
82             if (LOG.isWarnEnabled()) {
83                 LOG.warn(getTextMessage(action, "struts.messages.invalid.content.type", new String[]{inputName}));
84             }
85         }
86     }
87 
88     // invoke action
89     return invocation.invoke();
90 }

 1 <div>
 2     <label>附件上传1</label>
 3     <input name="file" type="file">
 4     <input name="file" type="file">
 5 </div>
 6 <div>
 7     <label>附件上传2</label>
 8     <input name="test" type="file">
 9     <input name="test" type="file">
10 </div>

//对应前台页面中的name=“file”的一组定义
private List<File> file;
private List<String> fileContentType;
private List<String> fileFileName;

public List<File> getFile() {
    return file;
}

public void setFile(List<File> file) {
    this.file = file;
}

public List<String> getFileContentType() {
    return fileContentType;
}

public void setFileContentType(List<String> fileContentType) {
    this.fileContentType = fileContentType;
}

public List<String> getFileFileName() {
    return fileFileName;
}

public void setFileFileName(List<String> fileFileName) {
    this.fileFileName = fileFileName;
}

 1 //对应前台name为test的属性文件列表
 2 private List<File> test;
 3 private List<String> testContentType;
 4 private List<String> testFileName;
 5 public List<File> getTest() {
 6     return test;
 7 }
 8 
 9 public void setTest(List<File> test) {
10     this.test = test;
11 }
12 
13 public List<String> getTestContentType() {
14     return testContentType;
15 }
16 
17 public void setTestContentType(List<String> testContentType) {
18     this.testContentType = testContentType;
19 }
20 
21 public List<String> getTestFileName() {
22     return testFileName;
23 }
24 
25 public void setTestFileName(List<String> testFileName) {
26     this.testFileName = testFileName;
27 }