查看: 4886|回复: 0

[知识点] Android 上传文件到服务器

94 主题	107 帖子	2042 积分

传奇人物

Rank: 6 Rank: 6

积分: 2042

发消息

发表于 2017-7-31 17:25:05 | 显示全部楼层 |阅读模式

本帖最后由 wx_pmZ7777t 于 2017-7-31 17:27 编辑

摘自X神之怒博客

[android]代码库
Android客户端

view sourceprint?
package com.example.testandroid;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class PhotoUpload extends Activity {
private String newName = "image.jpg";
private String uploadFile = "/sdcard/image.JPG";// 要上传的文件
private String actionUrl = "http://192.168.0.1:8080/PhotoUpload/servlet/UploadServlet";
private TextView mText1;
private TextView mText2;
private Button mButton;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mText1 = (TextView) findViewById(R.id.myText2);
// 文件路径：
mText1.setText(uploadFile);
mText2 = (TextView) findViewById(R.id.myText3);
// 上传网址：
mText2.setText(actionUrl);
/* 设置mButton的onClick事件处理 */
mButton = (Button) findViewById(R.id.myButton);
mButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
uploadFile();
}
});
}
/* 上传文件至Server的方法 */
private void uploadFile() {
String end = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
try {
URL url = new URL(actionUrl);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
/* 允许Input、Output，不使用Cache */
con.setDoInput(true);
con.setDoOutput(true);
con.setUseCaches(false);
// 设置http连接属性
con.setRequestMethod("POST");
con.setRequestProperty("Connection", "Keep-Alive");
con.setRequestProperty("Charset", "UTF-8");
con.setRequestProperty("Content-Type",
"multipart/form-data;boundary=" + boundary);
DataOutputStream ds = new DataOutputStream(con.getOutputStream());
ds.writeBytes(twoHyphens + boundary + end);
ds.writeBytes("Content-Disposition: form-data; "
+ "name="file1";filename="" + newName + """ + end);
ds.writeBytes(end);
// 取得文件的FileInputStream
FileInputStream fStream = new FileInputStream(uploadFile);
/* 设置每次写入1024bytes */
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int length = -1;
/* 从文件读取数据至缓冲区 */
while ((length = fStream.read(buffer)) != -1) {
/* 将资料写入DataOutputStream中 */
ds.write(buffer, 0, length);
}
ds.writeBytes(end);
ds.writeBytes(twoHyphens + boundary + twoHyphens + end);
fStream.close();
ds.flush();
/* 取得Response内容 */
InputStream is = con.getInputStream();
int ch;
StringBuffer b = new StringBuffer();
while ((ch = is.read()) != -1) {
b.append((char) ch);
}
/* 将Response显示于Dialog */
showDialog("上传成功" + b.toString().trim());
/* 关闭DataOutputStream */
ds.close();
} catch (Exception e) {
showDialog("上传失败" + e);
}
}
/* 显示Dialog的method */
private void showDialog(String mess) {
new AlertDialog.Builder(PhotoUpload.this).setTitle("Message")
.setMessage(mess)
.setNegativeButton("确定", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
}).show();
}
}