Java乔晓松-android中上传图片到服务器Tomcat(Struts2)
在做android开发的时候，有时你会用到图片的上传功能，在我的android项目中，我是选中图片，点击上传多张图片
android客户端上传图片部分的代码如下：
package com.example.myphotos.utils;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.UUID;
import android.util.Log;
public class UploadUtil {
private static final String TAG = "uploadFile";
private static final int TIME_OUT = 10 * 1000; // 超时时间
private static final String CHARSET = "utf-8"; // 设置编码
/**
* 上传文件到服务器
*
* @param file
* 需要上传的文件
* @param RequestURL
* 请求的rul
* @return 返回响应的内容
*/
public static int uploadFile(File file, String RequestURL) {
int res = 0;
String result = null;
String BOUNDARY = UUID.randomUUID().toString(); // 边界标识 随机生成
String PREFIX = "--", LINE_END = "\r\n";
String CONTENT_TYPE = "multipart/form-data"; // 内容类型
try {
URL url = new URL(RequestURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(TIME_OUT);
conn.setConnectTimeout(TIME_OUT);
conn.setDoInput(true); // 允许输入流
conn.setDoOutput(true); // 允许输出流
conn.setUseCaches(false); // 不允许使用缓存
conn.setRequestMethod("POST"); // 请求方式
conn.setRequestProperty("Charset", CHARSET); // 设置编码
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary="
+ BOUNDARY);
if (file != null) {
/**
* 当文件不为空时执行上传
*/
DataOutputStream dos = new DataOutputStream(
conn.getOutputStream());
StringBuffer sb = new StringBuffer();
sb.append(PREFIX);
sb.append(BOUNDARY);
sb.append(LINE_END);
/**
* 这里重点注意： name里面的值为服务器端需要key 只有这个key 才可以得到对应的文件
* filename是文件的名字，包含后缀名
*/
sb.append("Content-Disposition: form-data; name=\"file\"; filename=\""
+ file.getName() + "\"" + LINE_END);
sb.append("Content-Type: application/octet-stream; charset="
+ CHARSET + LINE_END);
sb.append(LINE_END);
dos.write(sb.toString().getBytes());
InputStream is = new FileInputStream(file);
byte[] bytes = new byte[1024];
int len = 0;
while ((len = is.read(bytes)) != -1) {
dos.write(bytes, 0, len);
}
is.close();
dos.write(LINE_END.getBytes());
byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END)
.getBytes();
dos.write(end_data);
dos.flush();
/**
* 获取响应码 200=成功 当响应成功，获取响应的流
*/
res = conn.getResponseCode();
Log.e(TAG, "response code:" + res);
if (res == 200) {
Log.e(TAG, "request success");
InputStream input = conn.getInputStream();
StringBuffer sb1 = new StringBuffer();
int ss;
while ((ss = input.read()) != -1) {
sb1.append((char) ss);
}
result = sb1.toString();
Log.e(TAG, "result : " + result);
} else {
Log.e(TAG, "request error");
}
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return res;
}
}
服务器段的代码如下：
服务器端用的Struts2，网上基本上都是Servlet，所以我就把Struts2的写出来，供大家学习
package www.csdn.image;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Random;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.fileupload.DiskFileUpload;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
/**
* ImagesAction 2013-6-18 下午9:02:58
*
* @author 乔晓松
*
*/
public class ImagesAction extends ActionSupport {
/**
*
*/
private static final long serialVersionUID = 1L;
public List<String> list = new ArrayList<String>();
private File file;
private String fileContentType;
private String fileFileName;
public File getFile() {
return file;
}
public void setFile(File file) {
this.file = file;
}
public String getFileContentType() {
return fileContentType;
}
public void setFileContentType(String fileContentType) {
this.fileContentType = fileContentType;
}
public String getFileFileName() {
return fileFileName;
}
public void setFileFileName(String fileFileName) {
this.fileFileName = fileFileName;
}
public List<String> getList() {
return list;
}
public String httpAllImages() {
String path = ServletActionContext.getServletContext().getRealPath(
"images");
// System.out.println(path);
File filePath = new File(path);
File[] files = filePath.listFiles();
for (int i = 0; i < files.length; i++) {
File file = files[i];
if (!file.isDirectory()) {
String fileName = file.getName();
String img = fileName.substring(fileName.lastIndexOf(".") + 1);
if ("jpg".equals(img) || "jpeg".equals(img)
|| "gif".equals(img) || "png".equals(img)) {
list.add(fileName);
}
}
}
System.out.println(list.size());
return "images";
}
@SuppressWarnings("deprecation")
public String uploadFile() {
System.out.println("-----------------");
System.out.println(fileFileName + "------------------" + file.length());
try {
FileInputStream fis = new FileInputStream(file);
String photospath = ServletActionContext.getRequest().getRealPath(
"photos");
System.out.println(photospath);
File fs = new File(photospath, fileFileName);
FileOutputStream fos = new FileOutputStream(fs);
int len = 0;
byte[] buffer = new byte[1024];
while ((len = fis.read(buffer)) != -1) {
fos.write(buffer, 0, len);
}
fos.flush();
fos.close();
fis.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return "uploadfile";
}
}
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<include file="struts-constant.xml"></include>
<package name="test" namespace="/csdn" extends="json-default">
<action name="ImagesAction_*" class="www.csdn.image.ImagesAction"
method="{1}">
<result name="images" type="json">list</result>
<result name="uploadfile"></result>
</action>
</package>
</struts>