@Resource 注入资源方式示例
2011-09-30 10:25
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package com.helloweenvsfei.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class InjectionServlet extends HttpServlet {
private @Resource(name = "hello")
String hello;
private @Resource(name = "i")
int i;
@Resource(name = "persons")
private String persons;
/**
* Constructor of the object.
*/
public InjectionServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setCharacterEncoding("UTF-8");
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>资源注入</TITLE></HEAD>");
out.println("<style>body {font-size:12px;}</style>");
out.println("<b>注入的字符串</b>: <br/> - "+hello+"<br/>");
out.println("<b>注入的整数</b>: <br/> - "+i+"<br/>");
out.println("<b>注入的字符串数组</b>:<br/>");
for(String person:persons.split(",")){
out.println(" - "+person+"<br/>");
}
out.println(" <BODY>");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to
* post.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the POST method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException
* if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>InjectionServlet</servlet-name>
<servlet-class>com.helloweenvsfei.servlet.InjectionServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>InjectionServlet</servlet-name>
<url-pattern>/servlet/InjectionServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<login-config>
<auth-method>BASIC</auth-method>
</login-config>
<env-entry>
<env-entry-name>hello</env-entry-name>
<env-entry-type>java.lang.String</env-entry-type>
<env-entry-value>Hello, Welcom to the JavaEE Resource Injection.</env-entry-value>
</env-entry>
<env-entry>
<env-entry-name>i</env-entry-name>
<env-entry-type>java.lang.Integer</env-entry-type>
<env-entry-value>30</env-entry-value>
</env-entry>
<env-entry>
<env-entry-name>persons</env-entry-name>
<env-entry-type>java.lang.String</env-entry-type>
<env-entry-value>Helloween,Cobain,Roses,Axl,</env-entry-value>
</env-entry>
</web-app>
import java.io.IOException;
import java.io.PrintWriter;
import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class InjectionServlet extends HttpServlet {
private @Resource(name = "hello")
String hello;
private @Resource(name = "i")
int i;
@Resource(name = "persons")
private String persons;
/**
* Constructor of the object.
*/
public InjectionServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setCharacterEncoding("UTF-8");
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>资源注入</TITLE></HEAD>");
out.println("<style>body {font-size:12px;}</style>");
out.println("<b>注入的字符串</b>: <br/> - "+hello+"<br/>");
out.println("<b>注入的整数</b>: <br/> - "+i+"<br/>");
out.println("<b>注入的字符串数组</b>:<br/>");
for(String person:persons.split(",")){
out.println(" - "+person+"<br/>");
}
out.println(" <BODY>");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to
* post.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the POST method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException
* if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>InjectionServlet</servlet-name>
<servlet-class>com.helloweenvsfei.servlet.InjectionServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>InjectionServlet</servlet-name>
<url-pattern>/servlet/InjectionServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<login-config>
<auth-method>BASIC</auth-method>
</login-config>
<env-entry>
<env-entry-name>hello</env-entry-name>
<env-entry-type>java.lang.String</env-entry-type>
<env-entry-value>Hello, Welcom to the JavaEE Resource Injection.</env-entry-value>
</env-entry>
<env-entry>
<env-entry-name>i</env-entry-name>
<env-entry-type>java.lang.Integer</env-entry-type>
<env-entry-value>30</env-entry-value>
</env-entry>
<env-entry>
<env-entry-name>persons</env-entry-name>
<env-entry-type>java.lang.String</env-entry-type>
<env-entry-value>Helloween,Cobain,Roses,Axl,</env-entry-value>
</env-entry>
</web-app>
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