JavaWeb -- Struts1 多文件上传与下载 DownloadAction， DispatchAction
1. 多文件上传与下载
上传下载jsp:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<a href="${pageContext.request.contextPath }/downFile.do">下载</a>
<form action="${pageContext.request.contextPath }/UpFile.do" method="post" enctype="multipart/form-data">
上传用户：<input type="text" name="username"><br/>
上传文件1:<input type="file" name="list[0]"><br/>
上传文件2:<input type="file" name="list[1]"><br/>
<input type="submit" value="上传">
</form>
</body>
</html>
actionform bean:
public class UpFileFormBean extends ActionForm {
private String username;
private List<FormFile> list = new ArrayList();;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public FormFile getList(int index) {
return list.get(index);
}
public void setList(int index,FormFile file) {
list.add(file);
}
public List<FormFile> getAll(){
return list;
}
}
上传action:
//加过滤器解决乱码
public class UpFileAction extends Action {
@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
UpFileFormBean formbean = (UpFileFormBean) form;
/* //单文件上传
System.out.println("上传用户：" + formbean.getUsername());
FormFile file = formbean.getUpfile();
String filename = file.getFileName();
InputStream in = file.getInputStream();
FileOutputStream out = new FileOutputStream("c:\\" + filename);
int len = 0;
byte buffer[] = new byte[1024];
while((len=in.read(buffer))>0){
out.write(buffer, 0, len);
}
in.close();
out.close();*/
//多文件上传
List<FormFile> all = formbean.getAll();
System.out.println(all.size());
for(FormFile formFile : all){
String filename = formFile.getFileName();
InputStream in = formFile.getInputStream();
FileOutputStream out = new FileOutputStream("c:\\" + filename);
int len = 0;
byte buffer[] = new byte[1024];
while((len=in.read(buffer))>0){
out.write(buffer, 0, len);
}
in.close();
out.close();
}
return super.execute(mapping, form, request, response);
}
}
下载action:
public class DownFileAction extends DownloadAction {
@Override
protected StreamInfo getStreamInfo(ActionMapping arg0, ActionForm arg1,
HttpServletRequest request, HttpServletResponse response) throws Exception {
response.setHeader("content-disposition", "attachment;filename=1.jpg");
String downfile = request.getSession().getServletContext().getRealPath("/download/1.jpg"); //servlet
return new DownloadAction.FileStreamInfo("image/jpg", new File(downfile));
}
}
struts-config.xml 配置文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"
"http://struts.apache.org/dtds/struts-config_1_3.dtd">
<struts-config>
<form-beans>
<form-bean name="UpFileFormBean" type="cn.itcast.web.formbean.UpFileFormBean"></form-bean>
</form-beans>
<action-mappings>
<action path="/downFile" type="cn.itcast.web.action.DownFileAction"></action>
<action path="/UpFile"
type="cn.itcast.web.action.UpFileAction"
name="UpFileFormBean"
scope="request"
>
</action>
</action-mappings>
<!--最大上传文件-->
<controller processorClass="org.apache.struts.action.RequestProcessor" maxFileSize="1K"></controller>
</struts-config>
web.xml 配置文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<servlet-name>ActionServlet</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>ActionServlet</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
2. 如何实现一个action处理多个请求, 两种实现 DispatchAction 和 MappingDispatchAction
多请求jsp:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP '1.jsp' starting page</title>
</head>
<body>
<html:link action="/BookAction?method=add">添加图书</html:link>
<html:link action="/BookAction?method=delete">删除图书</html:link>
<html:link action="/BookAction?method=update">修改图书</html:link>
<html:link action="/BookAction?method=find">查找图书</html:link>
<br/> <br/>---------------------------------------------<br/><br/>
<html:link action="/addbook">添加图书</html:link>
<html:link action="/deletebook">删除图书</html:link>
<html:link action="/updatebook">修改图书</html:link>
<html:link action="/findbook">查找图书</html:link>
</body>
</html>
action 处理，两种实现DispatchAction 和 MappingDispatchAction， 配置文件不同
//DispatchAction---action ---execute() add
/*
String method = mapping.getParamter();
String methodName = request.getParameter(method); //add update
*/
public class BookAction extends DispatchAction {
public ActionForward add(ActionMapping arg0, ActionForm arg1,
HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {
System.out.println("add....");
return null;
}
public ActionForward update(ActionMapping arg0, ActionForm arg1,
HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {
System.out.println("udpate....");
return null;
}
public ActionForward delete(ActionMapping arg0, ActionForm arg1,
HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {
System.out.println("delete....");
return null;
}
public ActionForward find(ActionMapping arg0, ActionForm arg1,
HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {
System.out.println("find....");
return null;
}
}
public class BookAction2 extends MappingDispatchAction {
public ActionForward add(ActionMapping arg0, ActionForm arg1,
HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {
System.out.println("add....");
return null;
}
public ActionForward update(ActionMapping arg0, ActionForm arg1,
HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {
// TODO Auto-generated method stub
System.out.println("udpate....");
return null;
}
public ActionForward delete(ActionMapping arg0, ActionForm arg1,
HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {
// TODO Auto-generated method stub
System.out.println("delete....");
return null;
}
public ActionForward find(ActionMapping arg0, ActionForm arg1,
HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {
// TODO Auto-generated method stub
System.out.println("find....");
return null;
}
web.xml 配置文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<!--struts配置文件可以添加多个配置文件struts-config2.xml-->
<servlet>
<servlet-name>ActionServlet</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml,/WEB-INF/struts-config2.xml</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>ActionServlet</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
struts-config.xml 配置文件1
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"
"http://struts.apache.org/dtds/struts-config_1_3.dtd">
<struts-config>
<action-mappings>
<action path="/BookAction"
type="cn.itcast.web.action.BookAction"
parameter="method"> <!-- 告诉struts，要调用的方法名称是通过什么参数带过来的 -->
</action>
</action-mappings>
</struts-config>
struts-config2.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"
"http://struts.apache.org/dtds/struts-config_1_3.dtd">
<struts-config>
<action-mappings>
<action path="/addbook" type="cn.itcast.web.action.BookAction2" parameter="add"/>
<action path="/updatebook" type="cn.itcast.web.action.BookAction2" parameter="update"/>
<action path="/findbook" type="cn.itcast.web.action.BookAction2" parameter="find"/>
<action path="/deletebook" type="cn.itcast.web.action.BookAction2" parameter="delete"/>
</action-mappings>
</struts-config>
