客户端访问服务器接收显示一条数据

              客户端向服务器发请求然后信息返回到客户端，在本地显示出来显示在一个ListView里面

 

 

1  客户端向服务器发请求  定义一个Activity   ：WorkApprovalSHowActivity

 

import java.util.ArrayList;

import com.hwtt.android.mobileoa.R;
import com.hwtt.android.mobileoa.adapter.LeaveInfoAdapter;
import com.hwtt.android.mobileoa.bean.LeaveInfo;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;

public class WorkApprovalSHowActivity extends Activity {
 private ListView lv_leave;
 LeaveInfoAdapter lva;
 ArrayList<LeaveInfo> list = new ArrayList<LeaveInfo>();
 //  Context context;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  setContentView(R.layout.leave_show);
  lv_leave = (ListView) findViewById(R.id.leave_show_list);

  try {
   
   list = JSONUtil.postRequest("http://172.16.10.131:8080/workflow/workapprove!phoneFindStatus.action");

   lva = new LeaveInfoAdapter(list, this);

   lv_leave.setAdapter(lva);
   // System.out.println(mainList);
  } catch (Exception e) {
   System.out.println("网络异常");
   e.printStackTrace();
  }
 }

}
2  客户端向服务器发请求后接收到的数据保存到list里面然后进行解析JsonUtil解析

package com.hwtt.android.mobileoa.ui;

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Iterator;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

import com.hwtt.android.mobileoa.bean.LeaveInfo;

public class JSONUtil {
 private static final String TAG = "JSONUtil";

 /**
  * 获取json内容
  *
  * @param url
  * @return JSONArray
  * @throws JSONException
  * @throws ConnectionException
  */
 public static JSONObject getJSON(String url) throws JSONException,
   Exception {

  return new JSONObject(getRequest(url));
 }

 /**
  * 向api发送get请求，返回从后台取得的信息。
  *
  * @param url
  * @return String
  */
 protected static String getRequest(String url) throws Exception {
  return getRequest(url, new DefaultHttpClient(new BasicHttpParams()));
 }

 protected static ArrayList<LeaveInfo> postRequest(String url)
   throws Exception {
  return postRequest(url, new DefaultHttpClient());
 }

 /**
  * 向api发送get请求，返回从后台取得的信息。
  *
  * @param url
  * @param client
  * @return String
  */
 protected static String getRequest(String url, DefaultHttpClient client)
   throws Exception {
  String result = null;
  int statusCode = 0;
  HttpGet getMethod = new HttpGet(url);
  Log.d(TAG, "do the getRequest,url=" + url + "");
  try {
   // getMethod.setHeader("User-Agent", USER_AGENT);
   HttpResponse httpResponse = client.execute(getMethod);
   // statusCode == 200 正常
   statusCode = httpResponse.getStatusLine().getStatusCode();
   Log.d(TAG, "statuscode = " + statusCode);
   // httpResponse.setEntity(new
   // UrlEncodedFormEntity(null,HTTP.UTF_8));
   // 处理返回的httpResponse信息
   // result=EntityUtils.toString(httpResponse.getEntity()).trim();
   // System.out.println("aaaaaaa:"+result);
   result = retrieveInputStream(httpResponse.getEntity());
   // System.out.println("aaaa:"+result);
  } catch (Exception e) {
   Log.e(TAG, e.getMessage());
   throw new Exception(e);
  } finally {
   getMethod.abort();
  }
  return result;
 }

 protected static ArrayList<LeaveInfo> postRequest(String url,
   DefaultHttpClient client) throws Exception {
  String result = null;
  int statusCode = 0;
  ArrayList<LeaveInfo> list = new ArrayList<LeaveInfo>();
  HttpPost getMethod = new HttpPost(url);
  Log.d(TAG, "do the postRequest,url=" + url + "");
  try {
   // getMethod.setHeader("User-Agent", USER_AGENT);
   HttpResponse httpResponse = client.execute(getMethod);
   // statusCode == 200 正常
   statusCode = httpResponse.getStatusLine().getStatusCode();
   Log.d(TAG, "statuscode = " + statusCode);
   // 处理返回的httpResponse信息
   if (statusCode == 200) {

    HttpEntity entity = httpResponse.getEntity();
    result = retrieveInputStream(entity);

//实例化JSONObject  将result转换成JSONObject  类型进行获取

 

     JSONObject  jsonObj = new JSONObject(result);
    String applyname = jsonObj.getString("applyname");
    String applytime = jsonObj.getString("applytime");
                String reason1=jsonObj.getString("reason");
                String status1=jsonObj.getString("status");
                LeaveInfo bean = new LeaveInfo();
                bean.setApplyname(applyname);
    bean.setApplytime(applytime);
    bean.setReason(reason1);
    bean.setStatus(status1);
    list.add(bean);
    System.out.println();
       }

  } catch (Exception e) {
   // Log.e(TAG, e.getMessage());
   throw new Exception(e);
  } finally {
   // getMethod.abort();
  }
  return list;
 }

 /**
  * 处理httpResponse信息,返回String
  *
  * @param httpEntity
  * @return String
  */
 protected static String retrieveInputStream(HttpEntity httpEntity) {

  int length = (int) httpEntity.getContentLength();
  // the number of bytes of the content, or a negative number if unknown.
  // If the content length is known but exceeds Long.MAX_VALUE, a negative
  // number is returned.
  // length==-1，下面这句报错，println needs a message
  if (length < 0)
   length = 10000;
  StringBuffer stringBuffer = new StringBuffer(length);
  try {
   InputStreamReader inputStreamReader = new InputStreamReader(
     httpEntity.getContent(), "gb2312");
   char buffer[] = new char[length];
   int count;
   while ((count = inputStreamReader.read(buffer, 0, length - 1)) > 0) {
    stringBuffer.append(buffer, 0, count);
   }
  } catch (UnsupportedEncodingException e) {
   Log.e(TAG, e.getMessage());
  } catch (IllegalStateException e) {
   Log.e(TAG, e.getMessage());
  } catch (IOException e) {
   Log.e(TAG, e.getMessage());
  }
  System.out.println("resulte:" + stringBuffer.toString());
  return stringBuffer.toString();
 }

}
3   定义填充ListView的Adapter

import java.util.List;

import com.hwtt.android.mobileoa.R;
import com.hwtt.android.mobileoa.bean.LeaveInfo;

 
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class LeaveInfoAdapter extends BaseAdapter {
 List<LeaveInfo>  list;
 Context mcontext;

 public LeaveInfoAdapter(List<LeaveInfo> list, Context context) {

  this. list = list;
  this.mcontext = context;
 }

 public void setResult(List<LeaveInfo> list, Context context) {
  this. list = list;
  this.mcontext = context;
 }

 @Override
 public int getCount() {
  // TODO Auto-generated method stub
  return list.size();
 }

 @Override
 public Object getItem(int position) {
  // TODO Auto-generated method stub
  return  list.get(position);
 }

 @Override
 public long getItemId(int position) {
  // TODO Auto-generated method stub
  return position;
 }

 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
  if (convertView == null) {
   LayoutInflater inflater = LayoutInflater.from(mcontext);
   convertView = inflater.inflate(R.layout.leave, null);
  }
  TextView tv_name = (TextView) convertView.findViewById(R.id.leave_name);
  tv_name.setText( "姓名:"+list.get(position).getApplyname());
  TextView tv_time = (TextView) convertView.findViewById(R.id.leave_time);
  tv_time.setText("请假时间"+ list.get(position).getApplytime());
  TextView tv_reason = (TextView) convertView
    .findViewById(R.id.leave_reason);
  tv_reason.setText( "请假原因"+list.get(position).getReason());
  TextView tv_status = (TextView) convertView
    .findViewById(R.id.leave_status);
  tv_status.setText( "状态:"+list.get(position).getStatus());

  return convertView;
 }

}
4   定义实体对象LeaveInfo

public class LeaveInfo {
 private String applyname  ;
 private String applytime  ;
 private String createTime ;
 private String creator ;
 private int id ;
 private String processDefinitionId ;
 private String props ;
 private String reason ;
 private String status  ;

 public LeaveInfo() {
  super();
  // TODO Auto-generated constructor stub
 }

 public LeaveInfo(String applyname, String applytime, String createTime,
   String creator, int id, String processDefinitionId, String props,
   String reason, String status) {
  super();
  this.applyname = applyname;
  this.applytime = applytime;
  this.createTime = createTime;
  this.creator = creator;
  this.id = id;
  this.processDefinitionId = processDefinitionId;
  this.props = props;
  this.reason = reason;
  this.status = status;
 }

 public String getApplyname() {
  return applyname;
 }

 public void setApplyname(String applyname) {
  this.applyname = applyname;
 }

 public String getApplytime() {
  return applytime;
 }

 public void setApplytime(String applytime) {
  this.applytime = applytime;
 }

 public String getCreateTime() {
  return createTime;
 }

 public void setCreateTime(String createTime) {
  this.createTime = createTime;
 }

 public String getCreator() {
  return creator;
 }

 public void setCreator(String creator) {
  this.creator = creator;
 }

 public int getId() {
  return id;
 }

 public void setId(int id) {
  this.id = id;
 }

 public String getProcessDefinitionId() {
  return processDefinitionId;
 }

 public void setProcessDefinitionId(String processDefinitionId) {
  this.processDefinitionId = processDefinitionId;
 }

 public String getProps() {
  return props;
 }

 public void setProps(String props) {
  this.props = props;
 }

 public String getReason() {
  return reason;
 }

 public void setReason(String reason) {
  this.reason = reason;
 }

 public String getStatus() {
  return status;
 }

 public void setStatus(String status) {
  this.status = status;
 }

 
}
4  ListView的XML文件  leave_show

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >
   
<ListView
    android:id="@+id/leave_show_list"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
   
    ></ListView>
</LinearLayout>

 

5  填充Adapter的XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
 
    <TextView
        android:id="@+id/leave_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        
        android:textColor="#000000"
        android:textSize="12dp" />

    <TextView
        android:id="@+id/leave_time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textColor="#000000" />

    <TextView
        android:id="@+id/leave_reason"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textColor="#000000"
        android:textSize="12dp" />

    <TextView
        android:id="@+id/leave_status"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textColor="#000000" />
 
</LinearLayout>

 

以上就是在客户端获取服务器的信息