Android(安卓)GET,POST向服务器端发送数据(发送)

//目录结构

//strings.xml字符常量文件

<?xmlversion="1.0"encoding="utf-8"?>
<resources>
<stringname="title">通过Get和Post两种方式分别提交数据到服务器</string>
<stringname="app_name">GetAndPostRequest</string>
<stringname="book_name">书本名称</string>
<stringname="book_price">书本价格</string>
<stringname="success">提交成功</string>
<stringname="error">提交失败</string>
<stringname="get_request">Get请求提交</string>
<stringname="post_request">Post请求提交</string>
</resources>

//main.xml 布局文件

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:Android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/title"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/book_name"
/>
<EditText
android:id="@+id/book_name"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/book_price"
/>
<EditText
android:id="@+id/book_price"
android:numeric="integer"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<Button
android:id="@+id/get_reqeust"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/get_request"
/>
<Button
android:id="@+id/post_reqeust"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/post_request"
/>
</LinearLayout>
</LinearLayout>

//RequestService.java 通过GET 和 Post请求的类

packagesn.len.request;
importjava.io.OutputStream;
importjava.net.HttpURLConnection;
importjava.net.URL;
importjava.net.URLEncoder;
importjava.util.Map;
publicclassRequestService
{
//get请求，有文件长度大小限制
publicstaticbooleangetRequest(StringurlPath)throwsException
{
URLurl=newURL(urlPath);
HttpURLConnectioncon=(HttpURLConnection)url.openConnection();
con.setRequestMethod("GET");
con.setReadTimeout(5*1000);
if(con.getResponseCode()==200)
{
returntrue;
}
returnfalse;
}
//post请求，无文件长度大小限制
publicstaticbooleanpostRequest(StringurlPath,Map<String,String>map)throwsException
{
StringBuilderbuilder=newStringBuilder();//拼接字符
//拿出键值
if(map!=null&&!map.isEmpty())
{
for(Map.Entry<String,String>param:map.entrySet())
{
builder.append(param.getKey()).append('=').append(URLEncoder.encode(param.getValue(),"utf-8")).append('&');
}
builder.deleteCharAt(builder.length()-1);
}
//下面的Content-Length:是这个URL的二进制数据长度
byteb[]=builder.toString().getBytes();
URLurl=newURL(urlPath);
HttpURLConnectioncon=(HttpURLConnection)url.openConnection();
con.setRequestMethod("POST");
con.setReadTimeout(5*1000);
con.setDoOutput(true);//打开向外输出
con.setRequestProperty("Content-Type","application/x-www-form-urlencoded");//内容类型
con.setRequestProperty("Content-Length",String.valueOf(b.length));//长度
OutputStreamoutStream=con.getOutputStream();
outStream.write(b);//写入数据
outStream.flush();//刷新内存
outStream.close();
//状态码是不成功
if(con.getResponseCode()==200)
{
returntrue;
}
returnfalse;
}
}

//GetAndPostRequestActivity.java 主要的控制类

packagesn.len.getandpostreq;
importjava.util.HashMap;
importjava.util.Map;
importsn.len.request.RequestService;
importAndroid.app.Activity;
importandroid.os.Bundle;
importandroid.util.Log;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.widget.EditText;
importandroid.widget.Toast;
publicclassGetAndPostRequestActivityextendsActivityimplementsOnClickListener
{
@Override
publicvoidonCreate(BundlesavedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Viewget_button=findViewById(R.id.get_reqeust);
Viewpost_button=findViewById(R.id.post_reqeust);
get_button.setOnClickListener(this);
post_button.setOnClickListener(this);
}
@Override
publicvoidonClick(Viewv)
{
EditTextbook_name=(EditText)findViewById(R.id.book_name);
EditTextbook_price=(EditText)findViewById(R.id.book_price);
Stringbookname=book_name.getText().toString();
Stringbookprice=book_price.getText().toString();
switch(v.getId())
{
caseR.id.get_reqeust://Get请求
{
//第一种可以用字符串拼接
StringurlPath="http://192.168.0.133/web/index.jsp"+"?type=save&book_name="+bookname+"&book_price="+bookprice+"";
StringrealPath=urlPath.replaceAll("","");//把多余的空格替换掉
try
{
if(RequestService.getRequest(realPath))
{
Toast.makeText(this,R.string.success,Toast.LENGTH_LONG).show();
}
}
catch(Exceptione)
{
Toast.makeText(this,R.string.error,Toast.LENGTH_LONG).show();
e.printStackTrace();
}
}break;
caseR.id.post_reqeust://Post请求
{
StringurlPath="http://192.168.0.133/web/index.jsp";
Map<String,String>map=newHashMap<String,String>();//用集合来做，比字符串拼接来得直观
map.put("type","save");
map.put("book_name",bookname);
map.put("book_price",bookprice);
try
{
if(RequestService.postRequest(urlPath,map))
{
Toast.makeText(this,R.string.success,Toast.LENGTH_LONG).show();
}
}
catch(Exceptione)
{
Toast.makeText(this,R.string.error,Toast.LENGTH_LONG).show();
Log.e("ERRORS",e.toString());
e.printStackTrace();
}
}break;
default:break;
}
}
}

//服务器端代码用JSP实现，就没有写Servlet了

<%@pagecontentType="text/html"pageEncoding="GBK"language="java"%>
<%
Stringtype=request.getParameter("type");
if(type!=null&&!"".equals(type))
{
if(type.equals("save"))
{
Stringbook_name=request.getParameter("book_name");
Stringbook_price=request.getParameter("book_price");
if((book_name!=null&&!"".equals(book_name))&&(book_price!=null&&!"".equals(book_price)))
{
System.out.println("书名"+book_name);
System.out.println("价格"+book_price);
}
}
}
%>

//效果

//Tomcat服务端响应效果，书名和价格都已经打出来了。

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