Android分别使用HTTP协议和TCP协议实现上传文件 .
2013-05-14 22:04
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Android上传文件有两种方式,第一种是基于Http协议的HttpURLConnection,第二种是基于TCP协议的Socket。 这两种方式的区别是使用HttpURLConnection上传时内部有缓存机制,如果上传较大文件会导致内存溢出。如果用TCP协议Socket方式上传就会解决这种弊端。
HTTP协议HttpURLConnection
1. 通过URL封装路径打开一个HttpURLConnection
2.设置请求方式以及头字段:Content-Type、Content-Length、Host
3.拼接数据发送
示例:
[java]
view plaincopyprint?
private static final String BOUNDARY = "---------------------------7db1c523809b2";//数据分割线
public boolean uploadHttpURLConnection(String username, String password, String path) throws Exception {
//找到sdcard上的文件
File file = new File(Environment.getExternalStorageDirectory(), path);
//仿Http协议发送数据方式进行拼接
StringBuilder sb = new StringBuilder();
sb.append("--" + BOUNDARY + "\r\n");
sb.append("Content-Disposition: form-data; name=\"username\"" + "\r\n");
sb.append("\r\n");
sb.append(username + "\r\n");
sb.append("--" + BOUNDARY + "\r\n");
sb.append("Content-Disposition: form-data; name=\"password\"" + "\r\n");
sb.append("\r\n");
sb.append(password + "\r\n");
sb.append("--" + BOUNDARY + "\r\n");
sb.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + path + "\"" + "\r\n");
sb.append("Content-Type: image/pjpeg" + "\r\n");
sb.append("\r\n");
byte[] before = sb.toString().getBytes("UTF-8");
byte[] after = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("UTF-8");
URL url = new URL("http://192.168.1.16:8080/14_Web/servlet/LoginServlet");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
conn.setRequestProperty("Content-Length", String.valueOf(before.length + file.length() + after.length));
conn.setRequestProperty("HOST", "192.168.1.16:8080");
conn.setDoOutput(true);
OutputStream out = conn.getOutputStream();
InputStream in = new FileInputStream(file);
out.write(before);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) != -1)
out.write(buf, 0, len);
out.write(after);
in.close();
out.close();
return conn.getResponseCode() == 200;
}
TCP协议Socket
1.我们可以使用Socket发送TCP请求,将上传数据分段发送
示例:
[java]
view plaincopyprint?
public boolean uploadBySocket(String username, String password, String path) throws Exception {
// 根据path找到SDCard中的文件
File file = new File(Environment.getExternalStorageDirectory(), path);
// 组装表单字段和文件之前的数据
StringBuilder sb = new StringBuilder();
sb.append("--" + BOUNDARY + "\r\n");
sb.append("Content-Disposition: form-data; name=\"username\"" + "\r\n");
sb.append("\r\n");
sb.append(username + "\r\n");
sb.append("--" + BOUNDARY + "\r\n");
sb.append("Content-Disposition: form-data; name=\"password\"" + "\r\n");
sb.append("\r\n");
sb.append(password + "\r\n");
sb.append("--" + BOUNDARY + "\r\n");
sb.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + path + "\"" + "\r\n");
sb.append("Content-Type: image/pjpeg" + "\r\n");
sb.append("\r\n");
// 文件之前的数据
byte[] before = sb.toString().getBytes("UTF-8");
// 文件之后的数据
byte[] after = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("UTF-8");
URL url = new URL("http://192.168.1.199:8080/14_Web/servlet/LoginServlet");
// 由于HttpURLConnection中会缓存数据, 上传较大文件时会导致内存溢出, 所以我们使用Socket传输
Socket socket = new Socket(url.getHost(), url.getPort());
OutputStream out = socket.getOutputStream();
PrintStream ps = new PrintStream(out, true, "UTF-8");
// 写出请求头
ps.println("POST /14_Web/servlet/LoginServlet HTTP/1.1");
ps.println("Content-Type: multipart/form-data; boundary=" + BOUNDARY);
ps.println("Content-Length: " + String.valueOf(before.length + file.length() + after.length));
ps.println("Host: 192.168.1.199:8080");
InputStream in = new FileInputStream(file);
// 写出数据
out.write(before);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) != -1)
out.write(buf, 0, len);
out.write(after);
in.close();
out.close();
return true;
}
搭建服务器,完成上传功能
[java]
view plaincopyprint?
package cn.test.web.servlet;
import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (isMultipart)
try {
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
List<FileItem> items = upload.parseRequest(request);
File dir = new File(request.getSession().getServletContext().getRealPath("/WEB-INF/upload"));
//创建目录
dir.mkdir();
for (FileItem item : items)
if (item.isFormField())
System.out.println(item.getFieldName() + ": " + item.getString());
else{
item.write(new File(dir,item.getName().substring(item.getName().lastIndexOf("\\")+1)));
}
} catch (Exception e) {
e.printStackTrace();
}
else {
System.out.println(request.getMethod());
System.out.println(request.getParameter("username"));
System.out.println(request.getParameter("password"));
}
}
}
Android上传文件有两种方式,第一种是基于Http协议的HttpURLConnection,第二种是基于TCP协议的Socket。 这两种方式的区别是使用HttpURLConnection上传时内部有缓存机制,如果上传较大文件会导致内存溢出。如果用TCP协议Socket方式上传就会解决这种弊端。
HTTP协议HttpURLConnection
1. 通过URL封装路径打开一个HttpURLConnection
2.设置请求方式以及头字段:Content-Type、Content-Length、Host
3.拼接数据发送
示例:
[java]
view plaincopyprint?
private static final String BOUNDARY = "---------------------------7db1c523809b2";//数据分割线
public boolean uploadHttpURLConnection(String username, String password, String path) throws Exception {
//找到sdcard上的文件
File file = new File(Environment.getExternalStorageDirectory(), path);
//仿Http协议发送数据方式进行拼接
StringBuilder sb = new StringBuilder();
sb.append("--" + BOUNDARY + "\r\n");
sb.append("Content-Disposition: form-data; name=\"username\"" + "\r\n");
sb.append("\r\n");
sb.append(username + "\r\n");
sb.append("--" + BOUNDARY + "\r\n");
sb.append("Content-Disposition: form-data; name=\"password\"" + "\r\n");
sb.append("\r\n");
sb.append(password + "\r\n");
sb.append("--" + BOUNDARY + "\r\n");
sb.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + path + "\"" + "\r\n");
sb.append("Content-Type: image/pjpeg" + "\r\n");
sb.append("\r\n");
byte[] before = sb.toString().getBytes("UTF-8");
byte[] after = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("UTF-8");
URL url = new URL("http://192.168.1.16:8080/14_Web/servlet/LoginServlet");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
conn.setRequestProperty("Content-Length", String.valueOf(before.length + file.length() + after.length));
conn.setRequestProperty("HOST", "192.168.1.16:8080");
conn.setDoOutput(true);
OutputStream out = conn.getOutputStream();
InputStream in = new FileInputStream(file);
out.write(before);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) != -1)
out.write(buf, 0, len);
out.write(after);
in.close();
out.close();
return conn.getResponseCode() == 200;
}
private static final String BOUNDARY = "---------------------------7db1c523809b2";//数据分割线 public boolean uploadHttpURLConnection(String username, String password, String path) throws Exception { //找到sdcard上的文件 File file = new File(Environment.getExternalStorageDirectory(), path); //仿Http协议发送数据方式进行拼接 StringBuilder sb = new StringBuilder(); sb.append("--" + BOUNDARY + "\r\n"); sb.append("Content-Disposition: form-data; name=\"username\"" + "\r\n"); sb.append("\r\n"); sb.append(username + "\r\n"); sb.append("--" + BOUNDARY + "\r\n"); sb.append("Content-Disposition: form-data; name=\"password\"" + "\r\n"); sb.append("\r\n"); sb.append(password + "\r\n"); sb.append("--" + BOUNDARY + "\r\n"); sb.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + path + "\"" + "\r\n"); sb.append("Content-Type: image/pjpeg" + "\r\n"); sb.append("\r\n"); byte[] before = sb.toString().getBytes("UTF-8"); byte[] after = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("UTF-8"); URL url = new URL("http://192.168.1.16:8080/14_Web/servlet/LoginServlet"); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY); conn.setRequestProperty("Content-Length", String.valueOf(before.length + file.length() + after.length)); conn.setRequestProperty("HOST", "192.168.1.16:8080"); conn.setDoOutput(true); OutputStream out = conn.getOutputStream(); InputStream in = new FileInputStream(file); out.write(before); byte[] buf = new byte[1024]; int len; while ((len = in.read(buf)) != -1) out.write(buf, 0, len); out.write(after); in.close(); out.close(); return conn.getResponseCode() == 200; }
TCP协议Socket
1.我们可以使用Socket发送TCP请求,将上传数据分段发送
示例:
[java]
view plaincopyprint?
public boolean uploadBySocket(String username, String password, String path) throws Exception {
// 根据path找到SDCard中的文件
File file = new File(Environment.getExternalStorageDirectory(), path);
// 组装表单字段和文件之前的数据
StringBuilder sb = new StringBuilder();
sb.append("--" + BOUNDARY + "\r\n");
sb.append("Content-Disposition: form-data; name=\"username\"" + "\r\n");
sb.append("\r\n");
sb.append(username + "\r\n");
sb.append("--" + BOUNDARY + "\r\n");
sb.append("Content-Disposition: form-data; name=\"password\"" + "\r\n");
sb.append("\r\n");
sb.append(password + "\r\n");
sb.append("--" + BOUNDARY + "\r\n");
sb.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + path + "\"" + "\r\n");
sb.append("Content-Type: image/pjpeg" + "\r\n");
sb.append("\r\n");
// 文件之前的数据
byte[] before = sb.toString().getBytes("UTF-8");
// 文件之后的数据
byte[] after = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("UTF-8");
URL url = new URL("http://192.168.1.199:8080/14_Web/servlet/LoginServlet");
// 由于HttpURLConnection中会缓存数据, 上传较大文件时会导致内存溢出, 所以我们使用Socket传输
Socket socket = new Socket(url.getHost(), url.getPort());
OutputStream out = socket.getOutputStream();
PrintStream ps = new PrintStream(out, true, "UTF-8");
// 写出请求头
ps.println("POST /14_Web/servlet/LoginServlet HTTP/1.1");
ps.println("Content-Type: multipart/form-data; boundary=" + BOUNDARY);
ps.println("Content-Length: " + String.valueOf(before.length + file.length() + after.length));
ps.println("Host: 192.168.1.199:8080");
InputStream in = new FileInputStream(file);
// 写出数据
out.write(before);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) != -1)
out.write(buf, 0, len);
out.write(after);
in.close();
out.close();
return true;
}
public boolean uploadBySocket(String username, String password, String path) throws Exception { // 根据path找到SDCard中的文件 File file = new File(Environment.getExternalStorageDirectory(), path); // 组装表单字段和文件之前的数据 StringBuilder sb = new StringBuilder(); sb.append("--" + BOUNDARY + "\r\n"); sb.append("Content-Disposition: form-data; name=\"username\"" + "\r\n"); sb.append("\r\n"); sb.append(username + "\r\n"); sb.append("--" + BOUNDARY + "\r\n"); sb.append("Content-Disposition: form-data; name=\"password\"" + "\r\n"); sb.append("\r\n"); sb.append(password + "\r\n"); sb.append("--" + BOUNDARY + "\r\n"); sb.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + path + "\"" + "\r\n"); sb.append("Content-Type: image/pjpeg" + "\r\n"); sb.append("\r\n"); // 文件之前的数据 byte[] before = sb.toString().getBytes("UTF-8"); // 文件之后的数据 byte[] after = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("UTF-8"); URL url = new URL("http://192.168.1.199:8080/14_Web/servlet/LoginServlet"); // 由于HttpURLConnection中会缓存数据, 上传较大文件时会导致内存溢出, 所以我们使用Socket传输 Socket socket = new Socket(url.getHost(), url.getPort()); OutputStream out = socket.getOutputStream(); PrintStream ps = new PrintStream(out, true, "UTF-8"); // 写出请求头 ps.println("POST /14_Web/servlet/LoginServlet HTTP/1.1"); ps.println("Content-Type: multipart/form-data; boundary=" + BOUNDARY); ps.println("Content-Length: " + String.valueOf(before.length + file.length() + after.length)); ps.println("Host: 192.168.1.199:8080"); InputStream in = new FileInputStream(file); // 写出数据 out.write(before); byte[] buf = new byte[1024]; int len; while ((len = in.read(buf)) != -1) out.write(buf, 0, len); out.write(after); in.close(); out.close(); return true; }
搭建服务器,完成上传功能
[java]
view plaincopyprint?
package cn.test.web.servlet;
import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (isMultipart)
try {
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
List<FileItem> items = upload.parseRequest(request);
File dir = new File(request.getSession().getServletContext().getRealPath("/WEB-INF/upload"));
//创建目录
dir.mkdir();
for (FileItem item : items)
if (item.isFormField())
System.out.println(item.getFieldName() + ": " + item.getString());
else{
item.write(new File(dir,item.getName().substring(item.getName().lastIndexOf("\\")+1)));
}
} catch (Exception e) {
e.printStackTrace();
}
else {
System.out.println(request.getMethod());
System.out.println(request.getParameter("username"));
System.out.println(request.getParameter("password"));
}
}
}
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