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struts常用知识
一,struts2是什么?
struts2是一个控制框架,相当于连接底层和显示层,控制页面和数据展示
二,为什么用struts2?
jsp+javabean模式:jsp里的小脚本java代码太多,页面杂乱
jsp+servlet+javabean模式:servlet和jspAPI强耦合,代码复用率低
jsp+struts2+javabean模式: 把servlet进行了封装,使用拦截器拦截请求,使用结果视图进行响应
三,struts2怎么用?
1.导入框架所需的包,软件默认在web-info下添加全局过滤器
<?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"> <display-name></display-name> <!-- 首页配置 --> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <!-- struts配置 --> <filter> <filter-name>struts2</filter-name> <filter-class> org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter </filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
2.编写action类,【继承ActionSupport】
package com.action; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import org.apache.commons.io.IOUtils; import org.apache.struts2.ServletActionContext; import com.bean.User; import com.dao.IUserDao; import com.dao.impl.UserDaoImpl; import com.opensymphony.xwork2.ActionSupport; import com.opensymphony.xwork2.ModelDriven; public class UserAction extends ActionSupport implements ModelDriven<User>{ //文件上传 private File file; private String fileContentType; private String fileFileName; public File getFile() { return file; } public void setFile(File file) { this.file = file; } public String getFileContentType() { return fileContentType; } public void setFileContentType(String fileContentType) { this.fileContentType = fileContentType; } public String getFileFileName() { return fileFileName; } public void setFileFileName(String fileFileName) { this.fileFileName = fileFileName; } //数据接收 private User u; public User getU() { return u; } public void setU(User u) { this.u = u; } @Override public User getModel() { if(this.u==null){ this.u=new User(); } return this.u; } public String add(){ //保存文件 String path = ServletActionContext.getServletContext().getRealPath("/upload/"); File dir=new File(path); if(!dir.exists()){ dir.mkdirs(); } try { FileInputStream input=new FileInputStream(file); FileOutputStream output=new FileOutputStream(path+"/"+fileFileName); IOUtils.copy(input, output); input.close(); output.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } //调用数据接口,添加数据库 IUserDao iud = new UserDaoImpl(); this.u.setPhoto(fileFileName); Integer result = iud.addUser(u); if(result>-1){ System.out.println("添加成功!"); }else{ System.out.println("添加失败!"); } return SUCCESS; } }
3.在struts.xml中注册action和相应的结果视图
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"> <struts> <!-- 设置上传文件大小 --> <constant name="struts.multipart.maxSize" value="10000000"></constant> <package name="test" namespace="/" extends="struts-default"> <action name="*_*" class="com.action.{1}Action" method="{2}"> <!-- 拦截器指定文件大小 --> <interceptor-ref name="fileUpload"> <param name="maximumSize">10000000</param> </interceptor-ref> <interceptor-ref name="defaultStack"/> <result name="success">success.jsp</result> </action> <!-- 文件上传测试 --> <action name="Uplod" class="com.action.UploadAction"> <!-- 拦截器指定文件大小 --> <interceptor-ref name="fileUpload"> <param name="maximumSize">10000000</param> </interceptor-ref> <interceptor-ref name="defaultStack"/> <result name="success">success.jsp</result> </action> </package> </struts>
struts常用知识
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