Android 与Springmvc之间交互若干问题(消息，文件，自定义dialog...)

基于Android前端与后台服务的项目中若干问题留份：

1. 文件收发：

Android 客户端：

import java.io.ByteArrayOutputStream;

import java.io.File ;

import java.io.IOException;

import java.io.InputStream;

import java.io.UnsupportedEncodingException;

import org.apache.commons.httpclient.HttpClient ;

import org.apache.commons.httpclient.HttpStatus ;

import org.apache.commons.httpclient.methods.PostMethod ;

import org.apache.commons.httpclient.methods.multipart.FilePart ;

import org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity ;

import org.apache.commons.httpclient.methods.multipart.Part ;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.ParseException;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.entity.StringEntity;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.util.EntityUtils;

import org.json.JSONException;

import org.json.JSONObject;

import android.os.Handler;

import android.os.Message;

public class HttpPicClient{

private static final int CHECK_MESSAGE_FINISHED=0x03;

private Message msg;

private String httpurl=null;

//private IdInfo myidinfo=null;

private Handler myHandler;

public void UpLoadFile ( String filepath,String serviceUrl)

{

String targetURL = null ;// TODO 指定URL

File targetFile = null ;// TODO 指定上传文件

targetFile = new File ( filepath) ;

targetURL = serviceUrl; // "http://10.10.10.158:8090/IDServer/TestServlet";servleturl

PostMethod filePost = new PostMethod ( targetURL ) ;

try

{

// 通过以下方法可以模拟页面参数提交

// filePost.setParameter("name", "中文");

// filePost.setParameter("pass", "1234");

Part [ ] parts =

{ new FilePart ( targetFile.getName ( ) , targetFile ) } ;

filePost.setRequestEntity ( new MultipartRequestEntity (

parts , filePost.getParams ( ) ) ) ;

HttpClient client = new HttpClient ( ) ;

client.getHttpConnectionManager ( ).getParams ( )

.setConnectionTimeout ( 5000 ) ;

int status = client.executeMethod ( filePost ) ;

if ( status == HttpStatus.SC_OK )

{

System.out.println ( "上传成功" ) ;

// 上传成功

}

else

{

System.out.println ( "上传失败" ) ;

// 上传失败

}

}

catch ( Exception ex )

{

ex.printStackTrace ( ) ;

}

finally

{

filePost.releaseConnection ( ) ;

}

}

public void queryDownloadFile(String IdNum,String url,Handler handler) {

myHandler=handler;

httpurl=url;

String IDNumber=IdNum;

HttpPost request = new HttpPost(httpurl);

// 先封装一个 JSON 对象

JSONObject param = new JSONObject();

try {

param.put("IDNumber", IDNumber);

} catch (JSONException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

// 绑定到请求 Entry

StringEntity se=null;

try {

se = new StringEntity(param.toString(),"UTF-8");

} catch (UnsupportedEncodingException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

request.setEntity(se);

// 发送请求

HttpResponse httpResponse = null;

try {

httpResponse = new DefaultHttpClient().execute(request);

} catch (ClientProtocolException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

HttpEntity entity = httpResponse.getEntity();

InputStream is=null;

try {

is = entity.getContent();

} catch (IllegalStateException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

ByteArrayOutputStream bos=new ByteArrayOutputStream();

byte[] buffer=new byte[1024];

int len = 0;

try {

while((len=is.read(buffer))!=-1){

bos.write(buffer,0,len);

}

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

byte[] dataImage=bos.toByteArray();

try {

bos.close();

is.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

msg = myHandler.obtainMessage(CHECK_MESSAGE_FINISHED, dataImage);//发送消息

myHandler.sendMessage(msg);

}

服务端：

1）.收：

public class UploadFileController extends AbstractController {

private String successView;

private String failView;

private PersonService personService=new PersonServiceImpl();

public String getSuccessView() {

return successView;

}

public void setSuccessView(String successView) {

this.successView = successView;

}

public String getFailView() {

return failView;

}

public void setFailView(String failView) {

this.failView = failView;

}

private static final String HEAD_PIC="-HeadPic.bmp";

private static final String FINGER_PIC="-FingerPic.bmp";

//定义上传路径

private String uploadPath = "D:\\TempSpringMVCUploadFiles" ; // 上传文件的目录

public void init( ) throws ServletException

{

File uploadFile = new File ( uploadPath ) ;

if ( ! uploadFile.exists ( ) )

{

uploadFile.mkdirs ( ) ;

}

}

@Override

protected ModelAndView handleRequestInternal(HttpServletRequest request,

HttpServletResponse response) throws Exception {

// TODO Auto-generated method stub

String rootfilePath = request.getSession().getServletContext().getRealPath("/") + "upload/";

File uploadFile = new File ( rootfilePath ) ;

if ( ! uploadFile.exists ( ) )

{

uploadFile.mkdirs ( ) ;

}

System.out.println(rootfilePath);

//init();

//创建一个通用的多部分解析器

CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());

//判断 request 是否有文件上传,即多部分请求

if(multipartResolver.isMultipart(request)){

//转换成多部分request

MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request;

//取得request中的所有文件名

Iterator<String> iter = multiRequest.getFileNames();

while(iter.hasNext()){

//记录上传过程起始时的时间，用来计算上传时间

int pre = (int) System.currentTimeMillis();

//取得上传文件

MultipartFile file = multiRequest.getFile(iter.next());

if(file != null){

//取得当前上传文件的文件名称

String myFileName = file.getOriginalFilename();

//如果名称不为“”,说明该文件存在，否则说明该文件不存在

if(myFileName.trim() !=""){

System.out.println(myFileName);

//重命名上传后的文件名

String fileName =file.getOriginalFilename();

File localFile = new File ( rootfilePath ,

fileName ) ;

file.transferTo(localFile);

/*

* 获取文件名信息并存储数据库索引以及文件

*/

String fileType=getFileType(fileName);

String fileID=getFileID(fileName);

String fileAbsolutePath=localFile.getAbsolutePath();

if(HEAD_PIC.equals(fileType)){

personService.insertPersonHeadPic(fileID, fileAbsolutePath);

System.out.println("update Head picture path:"+fileAbsolutePath+" success!");

}else if(FINGER_PIC.equals(fileType)){

personService.insertPersonFingerPic(fileID, fileAbsolutePath);

System.out.println("update Finger picture path:"+fileAbsolutePath+" success!");

}else{

System.out.println("file name error");

return null;

}

}

}

//记录上传该文件后的时间

int finaltime = (int) System.currentTimeMillis();

System.out.println(finaltime - pre);

}

return new ModelAndView(getSuccessView());

}else{

return new ModelAndView(getFailView());

}

}

private String getFileID(String filename){

String ID=filename.substring(0,18);

return ID;

}

private String getFileType(String filename){

String Type=filename.substring(18);

return Type;

}

2）download:

@RequestMapping("/downloadFileByID.do") // 请求url地址映射，类似Struts的action-mapping

//接收前台传过来的字符串格式的json对象，在后台进行解析

public void queryPersonFile(HttpServletRequest request,HttpServletResponse response) throws IOException {

String JsonStr=null;

InputStream in=request.getInputStream();

JsonStr=IOUtils.toString(in,"UTF-8");

JSONObject Jobj=JSONObject.fromString(JsonStr);

String idnumber=Jobj.getString("IDNumber");

if(idnumber.equals(ID_temp)){

/*

* 回传图片文件

*/

getFileForDowload(response,headPicPath_temp);

}else{

System.out.println("请求ID不匹配");

return;

}

ID_temp=null;

headPicPath_temp=null;

String resultMsg="query person head picture success";

System.out.println(resultMsg);

}

protected void getFileForDowload(HttpServletResponse response,String filepath){

//response.setContentType("text/html;charset=UTF-8");

BufferedInputStream bis = null;

BufferedOutputStream bos = null;

String downLoadPath = filepath;

long fileLength = new File(downLoadPath).length();

try {

bis = new BufferedInputStream(new FileInputStream(downLoadPath));

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

try {

bos = new BufferedOutputStream(response.getOutputStream());

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

byte[] buff = new byte[1024];

int bytesRead;

try {

while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {

bos.write(buff, 0, bytesRead);

}

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

try {

bis.close();

bos.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

============================

2. Json消息交互：

1）.Android：

public class HttpCheckInfoClient {

private static final int SAVE_MESSAGE=0x01;

private static final int CHECK_MESSAGE=0x02;

private static final int CHECK_MESSAGE_FINISHED=0x03;

private Message msg;

private String httpurl=null;

//private IdInfo myidinfo=null;

private Handler myHandler;

public void HttpSender(String IdNum,String url,Handler handler){

myHandler=handler;

httpurl=url;

String IDNumber=IdNum;

HttpPost request = new HttpPost(httpurl);

// 先封装一个 JSON 对象

JSONObject param = new JSONObject();

try {

param.put("IDNumber", IDNumber);

} catch (JSONException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

// 绑定到请求 Entry

StringEntity se=null;

try {

se = new StringEntity(param.toString(),"UTF-8");

} catch (UnsupportedEncodingException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

/*

* for Encoding Test

System.out.println(params);

System.out.println(se);

System.out.println(EntityUtils.toString(se,"iso-8859-1"));

System.out.println(EntityUtils.toString(se,"gb2312"));

System.out.println(EntityUtils.toString(se,"gbk"));

System.out.println(EntityUtils.toString(se,"utf-8"));

*/

request.setEntity(se);

// 发送请求

HttpResponse httpResponse = null;

try {

httpResponse = new DefaultHttpClient().execute(request);

} catch (ClientProtocolException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

// 得到应答的字符串，这也是一个 JSON 格式保存的数据

String retSrc=null;

if(httpResponse==null){

msg = myHandler.obtainMessage(SAVE_MESSAGE, "网络异常");//发送消息

myHandler.sendMessage(msg);

return;

}

try {

retSrc = EntityUtils.toString(httpResponse.getEntity());

} catch (ParseException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

} catch (IOException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

// 生成 JSON 对象

JSONObject result=null;

try {

result = new JSONObject( retSrc);

} catch (JSONException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

try {

IdInfo receiveIdinfo=new IdInfo();

JSONObject personObj=new JSONObject();

personObj = result.getJSONObject("Person");

receiveIdinfo.setInfo_Name(personObj.getString("name"));

receiveIdinfo.setInfo_Gender(personObj.getString("gender"));

msg = myHandler.obtainMessage(CHECK_MESSAGE, receiveIdinfo);//发送消息

myHandler.sendMessage(msg);

} catch (JSONException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

2）后台：

@RequestMapping("/checkPersonByID.do") // 请求url地址映射，类似Struts的action-mapping

//接收前台传过来的字符串格式的json对象，在后台进行解析

public void queryPersonObject(HttpServletRequest request,HttpServletResponse response) throws IOException {

String JsonStr=null;

InputStream in=request.getInputStream();

JsonStr=IOUtils.toString(in,"UTF-8");

JSONObject Jobj=JSONObject.fromString(JsonStr);

String idnumber=Jobj.getString("IDNumber");

Person resultPerson=null;

try {

resultPerson=personService.QueryPersonInfo(idnumber);

}catch (Exception e){

e.printStackTrace();

}

JSONObject resultParam=new JSONObject();

resultParam.put("name", resultPerson.getName());

resultParam.put("gender", resultPerson.getGender());

JSONObject rsultParams=new JSONObject();

rsultParams.put("Person", resultParam);

responseOutWithJson(response,rsultParams);

-------------------------------------------------------------------------------------

protected void responseOutWithJson(HttpServletResponse response,

JSONObject responseObject) {

//将实体对象转换为JSON Object转换

//JSONObject responseJSONObject = JSONObject.fromObject(responseObject);

response.setCharacterEncoding("UTF-8");

response.setContentType("application/json; charset=utf-8");

PrintWriter out = null;

try {

out = response.getWriter();

out.append(responseObject.toString());

} catch (IOException e) {

e.printStackTrace();

} finally {

if (out != null) {

out.close();

}

}

}

=========================

3. Android 自定义Dialog显示消息和图片：

1）OwndefinedDialog.xml :

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:gravity="center_vertical|center_horizontal"

android:background="@color/white">

<TextView

android:id="@+id/textView1"

android:layout_width="match_parent"

android:layout_height="38dp"

android:background="@drawable/dialog_title"

android:paddingTop="2dip"

android:text="数据库中返回信息"

android:gravity="center"

android:textColor="#000000" />

<LinearLayout

android:layout_width="301dp"

android:layout_height="173dp"

android:background="@drawable/dialog_body"

android:orientation="horizontal" >

<TextView

android:id="@+id/textView3"

android:layout_width="3dp"

android:layout_height="match_parent"

android:layout_weight="0.00"

android:text=" " />

<LinearLayout

android:layout_width="wrap_content"

android:layout_height="match_parent"

android:layout_weight="0.01"

android:orientation="vertical" >

<TextView

android:id="@+id/textView4"

android:layout_width="133dp"

android:layout_height="3dp"

android:text=" " />

<TextView

android:id="@+id/dialog_text"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:textColor="#000000" />

</LinearLayout>

<LinearLayout

android:layout_width="55dp"

android:layout_height="match_parent"

android:layout_weight="0.01"

android:orientation="vertical" >

<TextView

android:id="@+id/textView5"

android:layout_width="match_parent"

android:layout_height="3dp"

android:text=" " />

<ImageView

android:id="@+id/dialog_image"

android:layout_width="match_parent"

android:layout_height="113dp"

android:layout_weight="0.57" />

</LinearLayout>

</LinearLayout>

<LinearLayout

android:layout_width="match_parent"

android:layout_height="44dp"

android:orientation="vertical" >

<Button

android:id="@+id/dialog_button"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:background="@drawable/btn_1"

android:gravity="center"

android:paddingTop="5dip"

android:text="确定" />

<TextView

android:id="@+id/textView2"

android:layout_width="wrap_content"

android:layout_height="0dp"

android:text=""

android:textColor="#000000" />

</LinearLayout>

</LinearLayout>

2).values下的Style :添加

<style name="MyDialog" parent="@android:Theme.Dialog">

<item name="android:windowFrame">@null</item>

<item name="android:windowNoTitle">true</item>

<item name="android:windowBackground">@color/silver</item>

<item name="android:windowIsFloating">true</item>

<item name="android:windowContentOverlay">@null</item>

</style>

3）. Dialog类：

import com.ID.recogid.R;

import com.cr30a.activity.ConnectActivity;

import com.cr30a.asynctask.AsyncFingerprint;

import android.app.Dialog;

import android.content.Context;

import android.content.DialogInterface;

import android.content.Intent;

import android.graphics.Bitmap;

import android.graphics.drawable.BitmapDrawable;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.TextView;

public class MyOwnDialog extends Dialog {

Context context;

private TextView tv;

private ImageView iv;

private Button btn;

private String showmessage=null;

private Bitmap showimage=null;

public MyOwnDialog(Context context) {

super(context);

// TODO Auto-generated constructor stub

this.context = context;

}

public MyOwnDialog(Context context, int theme){

super(context, theme);

this.context = context;

}

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

this.setContentView(R.layout.owndefineddialog);

tv=(TextView)findViewById(R.id.dialog_text);

iv=(ImageView)findViewById(R.id.dialog_image);

btn=(Button)findViewById(R.id.dialog_button);

tv.setText(showmessage);

iv.setBackgroundDrawable(new BitmapDrawable(showimage));

btn.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

MyOwnDialog.this.dismiss();

}

});;

}

public void setParams(String msg,Bitmap image){

this.showmessage=msg;

this.showimage=image;

}

}

4）Activity调用：

MyOwnDialog dialog = new MyOwnDialog(IdReaderActivity.this,

R.style.MyDialog);

dialog.setParams(showMsg, thisHeadPic);

dialog.show();