学习到了安卓上传文件了!!!
在Android端,用到的是android-async-http框架,
github地址为:https://github.com/koush/AndroidAsync/
在AS中搭建该框架超级简单,只需要在build.gradle中加入下面2句(下图中×××标记的2处),然后build一下项目,AS会自动把该框架需要的jar包放入到lib里。
由于sdk自从5.0(或者6.0)之后抛弃了httpclient,所以用这个框架,需要手动添加一些配置,来使Android支持httpclient。
同样在build.gradle中加入标红的那一行配置即可
apply : android { compileSdkVersion buildToolsVersion defaultConfig { minSdkVersion targetSdkVersion } buildTypes { release { proguardFiles getDefaultProguardFile(), } } } dependencies { compile fileTree(: , : []) androidTestCompile(, { exclude : , : }) compile compile testCompile }
1、MainActivity
package com.yuanlp.fileupload;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import cz.msebera.android.httpclient.Header;
public class MainActivity extends AppCompatActivity {
private EditText mPost;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mPost = (EditText) findViewById(R.id.et_post);
/**
* 在cache文件夹下创建一个文件,用来上传
*/
File file=new File(getCacheDir(),"upload.txt");
try {
BufferedWriter writer=new BufferedWriter(new FileWriter(file));
writer.write("upload,test");
writer.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* button的onclick方法
* @param view
*/
public void upload(View view){
String path=mPost.getText().toString().trim();
if (TextUtils.isEmpty(path)){
Toast.makeText(this, "路径不能为空", Toast.LENGTH_SHORT).show();
}
File file=new File(path);
if (file.exists()&&file.length()>0){ //判断文件是否存在,且是否有内容
/**
* 下面是用框架做的上传文件
*/
AsyncHttpClient asyncHttpClient = new AsyncHttpClient();
RequestParams params = new RequestParams();
try {
params.put("file1",file); //这个名字一定要与web端获取文件时填写的名字一致,不然multipart获取不到文件
asyncHttpClient.post("http://192.168.1.111:10010/aos/talk/audio/savePdaFiles.jhtml", params, new AsyncHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
Toast.makeText(MainActivity.this,"上传成功",Toast.LENGTH_SHORT).show();
}
@Override
public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
Toast.makeText(MainActivity.this,"上传失败",Toast.LENGTH_SHORT).show();
}
});
} catch (Exception e) {
e.printStackTrace();
}
}else{
Toast.makeText(this, "文件不存在或内容为空", Toast.LENGTH_SHORT).show();
}
}
}
2 java web端,用springMVC
本来获取到multipartfile后,是通过multipart.getInputStream()方式来生成file文件,写入到硬盘的,但是一直获取不到这个输入流,暂时也没查到什么原因。就换了一种方法,直接用multipart的transferTo()方法,参数里是个file类型文件,这样子把文件写入后台
@RequestMapping(value = "savePdaFiles")
public void savePdaFiles(HttpServletRequest request, HttpServletResponse response) {
String file_path=request.getSession().getServletContext().getRealPath("upload/media");
MultipartHttpServletRequest multipartHttpServletRequest=(MultipartHttpServletRequest) request;
MultipartFile multipartFile=multipartHttpServletRequest.getFile("file1");
String fileName=multipartFile.getOriginalFilename();
try {
multipartFile.transferTo(new File(file_path+fileName));
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
3、web.xml配置拦截