Xheditor+structs2+js+jquery 实现文件下传功能

文件类FileUploadaction：

/**
?*?
?*/
package fileupload;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.json.annotations.JSON;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;

/**
?* @author 逯辉
?*文件上传的action
?*/
public class FileUploadAction extends ActionSupport
{

?/**
? *
? */
?private static final long serialVersionUID = 1L;

?private static Logger log = LoggerFactory.getLogger(FileUploadAction.class);
?
?private static final int BUFFER_SIZE = 16 * 1024;
?
?private File filedata;
?private String filedataContentType;
?private String filedataFileName;
?private String err;
?private String msg;
?
?
?private boolean success;//和form表单里回调函数success和failure对应，一定要有。
?private String info;? //上传成功与否的提示信息?
?
?
?
?
?public String getErr() {
??return err;
?}
?public void setErr(String err) {
??this.err = err;
?}
?public String getMsg() {
??return msg;
?}
?public void setMsg(String msg) {
??this.msg = msg;
?}
?@JSON(serialize =false)
?public String getInfo()
?{
??return info;
?}
?public void setInfo(String info)
?{
??this.info = info;
?}
?public boolean isSuccess()
?{
??return success;
?}
?public void setSuccess(boolean success)
?{
??this.success = success;
?}

?
?@JSON(serialize =false)
?public File getFiledata() {
??return filedata;
?}
?public void setFiledata(File filedata) {
??this.filedata = filedata;
?}
?@JSON(serialize =false)
?public String getFiledataContentType() {
??return filedataContentType;
?}
?public void setFiledataContentType(String filedataContentType) {
??this.filedataContentType = filedataContentType;
?}
?@JSON(serialize =false)
?public String getFiledataFileName() {
??return filedataFileName;
?}
?@JSON(serialize =false)
?public void setFiledataFileName(String filedataFileName) {
??this.filedataFileName = filedataFileName;
?}
?private? void writeFile(File src,File dest)
?{
??log.info("-----文件开始写入-----");
??InputStream in = null;
??OutputStream? out = null;
??try
??{
??? in = new BufferedInputStream(new FileInputStream(src),BUFFER_SIZE);
??? out? = new BufferedOutputStream(new FileOutputStream(dest),BUFFER_SIZE);
??? byte[] buffer = new byte[BUFFER_SIZE];
???
??? //开始写入
??? while(in.read(buffer)>0)
??? {
???? out.write(buffer);
??? }
??}
??catch(Exception e)
??{
???e.printStackTrace();
???success=false;
???info = "上传失败！";
???log.info("-----写入失败！IO异常-----");
??}
??finally
??{
???try
???{
???if(null!=in)
???{
????in.close();
???}
???if(null!=out)
???{
????out.close();
???}
???}
???catch(Exception e)
???{
????e.printStackTrace();
????success=false;
????info = "上传失败";
????log.info("-----写入失败！-----");
???}
??}
??log.info("-----写入成功！-----");
??
?}
?public String execute() throws Exception
?{

??log.info("-----要上传的文件名:"+filedataFileName);
??
??//获得wapps的路径，uploader 指的放在文件的地方
?? String toSrc = ServletActionContext.getServletContext().getRealPath("image")+"/"+filedataFileName;
??
?? log.info("-----文件保存的路径:"+toSrc);
?? msg="/Xheditor/image/"+filedataFileName;
?? err="";
?? File toFile = new File(toSrc);
?? writeFile(this.filedata,toFile);
?? success = true;
?? info = "上传成功！";
??
?? //必须加否则会出现下载框
?? HttpServletResponse response = ServletActionContext.getResponse();
??response.setContentType("text/html;charset=utf-8");
??? return NONE;//写成SUCCESS就不能调用JS的回调函数 success,暂时还不知道为什么。
?}
?
?

}

注意的是返回json数据{err:"如果是空字符串，文件上传成功，如果有字符返回错误信息",msg:"新文件名的路径图片链接的时候要用"}

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