extjs4 struts2 文件上传

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struts.xml中的配置文件，配置中要注意 param name= contentType , 不配置此项，或配置成“text/json”，在文件上传后，会有一个文件下载的提示。

    <package name="jfok" extends="json-default">  <action name="fileupload" class="com.jfok.UploadAction">  <interceptor-ref name="fileUploadStack"></interceptor-ref>  <result type="json">  <param name="contentType">text/html;charset=utf-8</param>  <param name="includeProperties">  success,resultMsg  </param>       </result>  </action>  </package>  

struts2 action

    package com.jfok;  import java.io.File;  import java.io.FileInputStream;  import java.io.FileOutputStream;  import java.io.UnsupportedEncodingException;  import com.opensymphony.xwork2.ActionSupport;  public class UploadAction extends ActionSupport {  private static final long serialVersionUID = 1L;  private File upload;        //上传的文件，在extjs 中对应 xtype:'fileuploadfield',  name:'upload'  private String fileName;    //上传的文件名  private String uploadContentType; //限制上传的后缀名  private String caption;     //form中其他的上传的字段  private Boolean success = true; //json中返回的结果  private String resultMsg = "ok" ;  //上传失败后，返回的错误结果  public File getUpload() {  return upload;  }  public void setUpload(File upload) {  this.upload = upload;  System.out.println("上传到tomcat中的临时文件名：" + upload.getPath());  }  public String getUploadFileName() {  return fileName;  }  public void setUploadFileName(String fileName) throws UnsupportedEncodingException {  System.out.println("上传的文件名：" +fileName);  this.fileName = fileName;  }  public  String getUploadContentType() {  return uploadContentType;  }  public  void setUploadContentType(String uploadContentType) {  this.uploadContentType = uploadContentType;  }  public String execute() throws Exception{  try { //此处为最简单的文件拷贝方法  java.io.InputStream is = new FileInputStream(upload);  java.io.OutputStream os = new FileOutputStream("d://a//"+fileName);  byte buffer[] = new byte[8192];  int count = 0;  while ((count = is.read(buffer)) > 0)  os.write(buffer, 0, count);  os.close();  is.close();  } catch (Exception e)  {  resultMsg = "上传文件失败，文件太大或没有选择上传的文件 ";  System.out.println(resultMsg);  success = false;  }  //此处会根据 success 和 resultMsg 返回 json  //{"resultMsg":"ok","success":true}  return SUCCESS;  }  public void setCaption(String caption) {  System.out.println("接收到的caption：" + caption );  this.caption = caption;  }  public String getCaption() {  return caption;  }  public Boolean getSuccess() {  return success;  }  public String getResultMsg() {  return resultMsg;  }  }  

EXT 的 内容

 Ext.onReady(function() {  
var fp = Ext.create( 'Ext.form.Panel', {  fileUpload : true,  items : [ {  xtype: 'textfield',  name : 'caption',  fieldLabel : '文件备注'  }, {  xtype : 'fileuploadfield',  fieldLabel : '选择上传文件',  name : 'upload',  allowBlank : true,  buttonText : '选择文件'  } ],  buttons : [ {  text : '保存',  handler : function() {  var form = this.up('form').getForm();  form.submit({  url : 'fileupload.action',  waitMsg: '正在上传...',  {"resultMsg":"ok","success":true}  success: function(fp, o) {  Ext.Msg.alert('上传成功!',o.result.resultMsg);  },  failure : function (fp,o){  Ext.Msg.alert('上传失败!',o.result.resultMsg);    }  });  }  } ]  
});  
var fw = Ext.create('Ext.Window', {  layout : 'fit',  title : '文件上传',  width : 500,  defaults : {scope : this},  items : [ fp ]  
});  
fw.show();   });  </script>  

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