使用httpclient模拟表单上传文件，后台用struts2接收

本人是使用java，开发android后台的，公司要求使用SSM框架，有一个功能要求是实现android大文件的上传。开发人员都是新手，以前没有开发经验，鼓捣了好久，也尝试了两个android框架，Xutils貌似跟struts2不太好整合，而AsyncHttpClient则遇到莫名奇妙的bug。后来本人查了很多资料，最后决定用httpclient模拟表单上传。

下面直接上代码

客户端部分：

public class HttpClientUpload{
	/**
	 *使用httpclient模拟form表单上传文件
	 * @param url 文件上传的目标地址
	 * @param filepath 要上传的文件路径
	 * @param mapParams 文字参数（采用键值对应）
	 */
	public static void upload(String url, String filepath,HashMap<String, String> mapParams) {
		HttpClient client = new DefaultHttpClient();
		HttpPost httpPost = new HttpPost(url);
		client.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION,HttpVersion.HTTP_1_1);
		client.getParams().setParameter(CoreProtocolPNames.HTTP_CONTENT_CHARSET, "utf-8");
		try {
			MultipartEntity entity = new MultipartEntity();//多个表单对象
			ContentBody fileBody = new FileBody(new File(filepath)); //表单文件域
			entity.addPart("upload", fileBody);
		    entity.addPart("path", new StringBody(mapParams.get("savePath")));	// 字符参数部分
			httpPost.setEntity(entity);
			HttpResponse response = client.execute(httpPost);//执行post操作，并返回response
			String jsonData = EntityUtils.toString(response.getEntity(), "UTF-8");
			System.out.println(jsonData);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	public static void main(String[] args) {
		String url ="http://localhost:8080/GoApp/uploadPro.action";
		String filepath="C:\\Users\\Administrator\\Desktop\\test.mkv";
		HashMap<String, String> mapParams = new HashMap<String, String>();
		mapParams.put("savePath", "\\gaopenghui");
		upload(url,filepath,mapParams);
	}
}

struts2的action配置：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
	<constant name="struts.i18n.encoding" value="utf-8" />
	<constant name="struts.multipart.maxSize" value="60000000" />
	<package name="struts2-message" extends="struts-default,json-default">
		<action name="uploadPro" class="com.eagle.message.action.UploadAction"
			method="upload">
			<!-- 默认的拦截器，必须要写 -->
			<interceptor-ref name="fileUpload">
				<param name="maximumSize">42830000</param>
			</interceptor-ref>
			<interceptor-ref name="defaultStack" />
			<param name="savePath">/upload</param>
			<result type="json"></result>
		</action>
	</package>
</struts>

action的处理部分：

package com.eagle.message.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private String path;
	private File upload;
	private String uploadContentType;
	private String uploadFileName;
	private String savePath;
	private HttpServletResponse response;

	public String getPath() {
		return path;
	}

	public void setPath(String path) {
		this.path = path;
	}

	@SuppressWarnings("deprecation")
	public String getSavePath() {
		return ServletActionContext.getRequest().getRealPath(savePath);
	}

	public void setSavePath(String savePath) {
		this.savePath = savePath;
	}

	public String getTitle() {
		return path;
	}

	public void setTitle(String title) {
		this.path = title;
	}

	public File getUpload() {
		return upload;
	}

	public void setUpload(File upload) {
		this.upload = upload;
	}

	public String getUploadContentType() {
		return uploadContentType;
	}

	public void setUploadContentType(String uploadContentType) {
		this.uploadContentType = uploadContentType;
	}

	public String getUploadFileName() {
		return uploadFileName;
	}

	public void setUploadFileName(String uploadFileName) {
		this.uploadFileName = uploadFileName;
	}

	/**
	 * 返回json数据的方法
	 * 
	 * @param json
	 *            要发送的数据
	 */
	public void response(String json) {
		response = ServletActionContext.getResponse();
		response.setContentType("application/json;charset=utf-8");
		try {
			PrintWriter out = response.getWriter();
			out.print(json);
			out.flush();
			out.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 响应上传文件请求的action方法
	 */
	public void upload() {
		File file = new File(getSavePath() + path);
		if (!file.exists()) {// 若文件目录不存在，则创建目录
			file.mkdirs();
		}
		try {
			FileOutputStream fos = new FileOutputStream(getSavePath() + path
					+ "\\" + uploadFileName);
			FileInputStream fis = new FileInputStream(getUpload());
			byte[] buffer = new byte[1024];
			int len = 0;
			while ((len = fis.read(buffer)) > 0) {
				fos.write(buffer, 0, len);
			}
			setUploadFileName(uploadFileName);
			fos.close();
			fis.close();
		} catch (Exception e) {
			response("文件上传失败");
			e.printStackTrace();
			return;
		}
		response("文件上传成功");
	}
}

struts2默认使用Jakarta的Common-FileUpload文件上传框架，它可以将表单发送来的数据进行封装，如action中的upload对应表单中的upload域，而path对应表单中的path域，除此之外action中还有uploadContentType封装了上传文件的文件类型，uploadFileName封装了上传文件的文件名（包括文件类型在内，如test.jpg）。

这是本菜鸟的第一篇博文，希望对大家有所帮助。

httpclient要用到的jar包如图所示：