java导出txt文本

页面

项目结构

html代码

<html>

</head>

  <body>

    <form action="down/downLoad" method="post">

    	<input type="text" name="name">

    	<input type="submit" value="Submit" />

    </form>

  </body>

</html>

注意form表单路径，也可以用request.getContextPath()/down/downLoad

web.xml　

<?xml version="1.0" encoding="UTF-8"?>

<web-app>

    <display-name>Spring MVC Application</display-name>

  

    <servlet>

		<servlet-name>mvc-dispatcher</servlet-name>

		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

		<load-on-startup>1</load-on-startup>

	</servlet>

  

    <servlet-mapping>

		<servlet-name>mvc-dispatcher</servlet-name>

		<url-pattern>/</url-pattern>

	</servlet-mapping>

  

    <context-param>

		<param-name>contextConfigLocation</param-name>

		<param-value>classpath*:mvc-dispatcher-servlet.xml</param-value>

	</context-param>

  

    <listener>

		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

	</listener>

</web-app>

spring配置

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns:context="http://www.springframework.org/schema/context"

    xmlns:mvc="http://www.springframework.org/schema/mvc"

    xmlns:p="http://www.springframework.org/schema/p"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

    http://www.springframework.org/schema/beans/spring-beans.xsd

    http://www.springframework.org/schema/mvc

    http://www.springframework.org/schema/mvc/spring-mvc.xsd

    http://www.springframework.org/schema/context

    http://www.springframework.org/schema/context/spring-context.xsd"  >  

  <context:component-scan base-package="main.*" />

	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

		<property name="prefix"><value>/WEB-INF/pages</value></property>

		<property name="suffix"><value>.jsp</value></property>

	</bean>

	<bean id="dataSource"   class="org.springframework.jdbc.datasource.DriverManagerDataSource"

    p:driverClassName="com.mysql.jdbc.Driver"

    p:url="jdbc:mysql://localhost:3306/Student?useUnicode=true&characterEncoding=UTF-8"

    p:username="root"

    p:password="root" />

</beans>

　如果不从数据库查的话只用到controller就行了，List的数据自己构造

controller

package main.controller;

import java.io.BufferedOutputStream;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import main.dao.GetInfoDao;

import main.model.Student;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

@Controller

@RequestMapping("/down")

public class DownLoadController {

	@Autowired

	private GetInfoDao dao;

	@RequestMapping("/downLoad")

	public void down(HttpServletRequest request,

            HttpServletResponse response){

		String name=request.getParameter("name");

		System.out.println("name:"+name);

		//List<Student> students=dao.getInfo();

		List<String> students = new ArrayList<String>();

		students.add("111111");

		students.add("222222");

		students.add("333333");

		students.add("444444");

		students.add("555555");

		//List<Student> students={};

		exportText(response, students);

	}

	public void exportText(HttpServletResponse response,List students){

		response.setContentType("text/plain");// 一下两行关键的设置

        response.addHeader("Content-Disposition","attachment;filename=20160629.txt");

        BufferedOutputStream buff = null;

        StringBuffer write = new StringBuffer();

        String tab = "  ";

        String enter = "\r\n";

        ServletOutputStream outSTr = null;

        try {

			outSTr = response.getOutputStream();

			buff = new BufferedOutputStream(outSTr);

            for (Object li :students) {

            	write.append("名字：" + tab);

                write.append(li + enter);

                write.append(enter);

            }

            buff.write(write.toString().getBytes("UTF-8"));

            buff.flush();

            buff.close();

		} catch (IOException e) {

			e.printStackTrace();

		}// 建立

	}

}

结果，导出来的数据

用到数据库的话,把数据库的数据查询出来放到List集合即可

这时候需要更新spring配置，XML配置不需要更改

我这使用springJdbc操作

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns:context="http://www.springframework.org/schema/context"

    xmlns:mvc="http://www.springframework.org/schema/mvc"

    xmlns:p="http://www.springframework.org/schema/p"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

    http://www.springframework.org/schema/beans/spring-beans.xsd

    http://www.springframework.org/schema/mvc

    http://www.springframework.org/schema/mvc/spring-mvc.xsd

    http://www.springframework.org/schema/context

    http://www.springframework.org/schema/context/spring-context.xsd"  >  

  <context:component-scan base-package="main.*" />

	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

		<property name="prefix"><value>/WEB-INF/pages</value></property>

		<property name="suffix"><value>.jsp</value></property>

	</bean>

	<bean id="dataSource"   class="org.springframework.jdbc.datasource.DriverManagerDataSource"

    p:driverClassName="com.mysql.jdbc.Driver"

    p:url="jdbc:mysql://localhost:3306/Student?useUnicode=true&characterEncoding=UTF-8"

    p:username="root"

    p:password="root" />

     <!-- 定义jdbc模板的bean -->

 <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"

 p:dataSource-ref="dataSource" />

</beans>

Student:

package main.model;

import org.springframework.stereotype.Component;

@Component

public class Student {

	private int id;

	private String name;

	private int age;

	public int getId() {

		return id;

	}

	public void setId(int id) {

		this.id = id;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	public int getAge() {

		return age;

	}

	public void setAge(int age) {

		this.age = age;

	}

}

DAO:

package main.dao;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

import main.model.Student;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.jdbc.core.JdbcTemplate;

import org.springframework.jdbc.core.RowMapper;

import org.springframework.stereotype.Repository;

@Repository

public class GetInfoDao {

	@Autowired

	private JdbcTemplate template;

	public List<Student> getInfo(){

		String sql="select * from T_Student";

		List<Student> students=new ArrayList<Student>();

		students=template.query(sql, new StudentMapper());

		return students;

	}

	public class StudentMapper implements RowMapper<Student> {

		  public Student mapRow(ResultSet rs, int rowNum) throws SQLException {

		   Student student = new Student();

		   student.setId(rs.getInt("id"));

		   student.setName(rs.getString("name"));

		   student.setAge(rs.getInt("age"));

		   return student;

		  }

	}

}

Controller:　

package main.controller;

import java.io.BufferedOutputStream;

import java.io.IOException;

import java.util.List;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import main.dao.GetInfoDao;

import main.model.Student;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

@Controller

@RequestMapping("/down")

public class DownLoadController {

	@Autowired

	private GetInfoDao dao;

	@RequestMapping("/downLoad")

	public void down(HttpServletRequest request,

            HttpServletResponse response){

		String name=request.getParameter("name");

		System.out.println("name:"+name);

		List<Student> students=dao.getInfo();

		exportText(response, students);

	}

	public void exportText(HttpServletResponse response,List students){

		response.setContentType("text/plain");// 一下两行关键的设置

        response.addHeader("Content-Disposition","attachment;filename=20160629.txt");

        BufferedOutputStream buff = null;

        StringBuffer write = new StringBuffer();

        String tab = "  ";

        String enter = "\r\n";

        ServletOutputStream outSTr = null;

        try {

			outSTr = response.getOutputStream();

			buff = new BufferedOutputStream(outSTr);

			write.append("ID"+tab+"姓名"+tab+"年龄"+ enter);

            for (int i=0;i<students.size();i++) {

            	Student s=(Student)students.get(i);

            	write.append(s.getId()+ tab);

                write.append(s.getName()+ tab);

                write.append(s.getAge()+ enter);

                write.append(enter);

            }

            buff.write(write.toString().getBytes("UTF-8"));

            buff.flush();

            buff.close();

		} catch (IOException e) {

			e.printStackTrace();

		}// 建立

	}

	public String delNull(String str){

		String xx="****";

		if (str!=null||!"".equals(str)){

			xx=str;

		}

		return xx;

	}

}

导出来的数据截图：

如果数据量大的话则采用先把数据写到一个文件里面，然后再去下载这个文件

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