Struts2文件上传

我通过使用两个Struts2插件Struts2 JQuery插件和Struts2 Scope插件来实现此目的

答案如下：

在您的Maven POM文件中包括这些依赖项：

        <dependency> <groupId>com.jgeppert.struts2.jquery</groupId> <artifactId>struts2-jquery</artifactId> <version>3.2.0</version> <type>pom</type>        </dependency>        <dependency> <groupId>com.googlepre.struts2scopeplugin</groupId> <artifactId>struts2-scope-plugin</artifactId> <version>1.0.4</version>        </dependency>

我们创建一个类来准备表单，如下所示：

 public class PrepareUpload extends ActionSupport{     @In (scope=ScopeType.CONVERSATION)      @Out (scope=ScopeType.CONVERSATION)      private List<File> fileUploadi = new ArrayList<File>();      @In (scope=ScopeType.CONVERSATION)      @Out (scope=ScopeType.CONVERSATION)        private List<String> fileUploadContentTypei = new ArrayList<String>();      @In (scope=ScopeType.CONVERSATION)      @Out (scope=ScopeType.CONVERSATION)        private List<String> fileUploadFileNamei = new ArrayList<String>();    @Action(value = "/prepareupload", results = { @Result(location = "upload.jsp", name = "success")          })          @End    public String execute() throws Exception      {        return SUCCESS;      }    public List<File> getFileUploadi() {        return fileUploadi;    }    public void setFileUploadi(List<File> fileUploadi) {        this.fileUploadi = fileUploadi;    }    public List<String> getFileUploadContentTypei() {        return fileUploadContentTypei;    }    public void setFileUploadContentTypei(List<String> fileUploadContentTypei) {        this.fileUploadContentTypei = fileUploadContentTypei;    }    public List<String> getFileUploadFileNamei() {        return fileUploadFileNamei;    }    public void setFileUploadFileNamei(List<String> fileUploadFileNamei) {        this.fileUploadFileNamei = fileUploadFileNamei;    }}

以及用于添加到列表和处理ajax调用的类，如下所示：

public class UploadAction extends ActionSupport {  private static final long serialVersionUID = 7968544374444173511L;  private static final Log  log   = LogFactory.getLog(UploadAction.class);  private String echo;  @In (scope=ScopeType.CONVERSATION)  @Out (scope=ScopeType.CONVERSATION)  private List<File> fileUploadi = new ArrayList<File>();  private List<File> fileUpload = new ArrayList<File>();  @In (scope=ScopeType.CONVERSATION)  @Out (scope=ScopeType.CONVERSATION)    private List<String> fileUploadContentTypei = new ArrayList<String>();  private List<String> fileUploadContentType = new ArrayList<String>();  @In (scope=ScopeType.CONVERSATION)  @Out (scope=ScopeType.CONVERSATION)    private List<String> fileUploadFileNamei = new ArrayList<String>();  private List<String> fileUploadFileName = new ArrayList<String>();  @Action(value = "/uploada", results = {    @Result(location = "simpleecho.jsp", name = "success")  })  @Begin  public String execute() throws Exception  {fileUploadi.addAll( fileUpload);fileUploadFileNamei.addAll(fileUploadFileName);fileUploadContentTypei.addAll(fileUploadContentType);   for (int i = 0;  i < fileUploadFileNamei.size();  i++)   {       if (echo == null)echo =   fileUploadFileNamei.get(i);       else      echo +=  "<br>" + fileUploadFileNamei.get(i);    log.info(echo);   }    return SUCCESS;  }  public String getEcho()  {    return echo;  }  public List<File> getFileUpload() {        return fileUpload;    }    public void setFileUpload(List<File> fileUpload) {        this.fileUpload = fileUpload;    }    public List<String> getFileUploadContentType() {        return fileUploadContentType;    }    public void setFileUploadContentType(List<String> fileUploadContentType) {        this.fileUploadContentType = fileUploadContentType;    }    public List<String> getFileUploadFileName() {        return fileUploadFileName;    }    public void setFileUploadFileName(List<String> fileUploadFileName) {        this.fileUploadFileName = fileUploadFileName;    }    public List<File> getFileUploadi() {        return fileUploadi;    }    public void setFileUploadi(List<File> fileUploadi) {        this.fileUploadi = fileUploadi;    }    public List<String> getFileUploadContentTypei() {        return fileUploadContentTypei;    }    public void setFileUploadContentTypei(List<String> fileUploadContentTypei) {        this.fileUploadContentTypei = fileUploadContentTypei;    }    public List<String> getFileUploadFileNamei() {        return fileUploadFileNamei;    }    public void setFileUploadFileNamei(List<String> fileUploadFileNamei) {        this.fileUploadFileNamei = fileUploadFileNamei;    }    }

最后，jsp应该类似于：

<%@ taglib prefix="s" uri="/struts-tags" %><%@ taglib prefix="sj" uri="/struts-jquery-tags"%><html><head><sj:head jqueryui="true" defaultLoadingText="Please wait ..."/><s:head /></head><body><h1>File Upload:</h1><s:form action="uploada" method="POST" enctype="multipart/form-data" theme="xhtml" ><s:file label="File:" name="fileUpload" size="40" /> <div id="result" >Add Files Below:</div><sj:submit  targets="result"  button="true"  validate="true"  value="Add File"  indicator="indicator" parentTheme="xhtml" /><sj:submit  button="true"  validate="true"  value="Submit"  indicator="indicator" parentTheme="xhtml" /></s:form></body></html>