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" />

以上就是在客户端获取服务器的信息

客户端访问服务器接收显示一条数据

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