Java导出csv表格

CSV简介

逗号分隔值（Comma-Separated Values，CSV，有时也称为字符分隔值，因为分隔字符也可以不是逗号），其文件以纯文
本形式存储表格数据（数字和文本）。

示例代码

import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import org.springbooks.bootTest.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {

    //BufferedOutputStream
    @GetMapping("/csv")
    public void csv(HttpServletResponse resp) throws IOException {
        resp.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
        resp.setHeader("Content-Disposition", "attachment;filename=111.csv");
        resp.setCharacterEncoding("UTF-8");
        ServletOutputStream os = resp.getOutputStream();
        BufferedOutputStream bos = new BufferedOutputStream(os);
        
        String[] titles = new String[]{"id","name","age"};
        List<Map<String,String>> list = new ArrayList<>();
        for(int i=0;i<10;i++) {
            Map<String,String> map = new HashMap<>();
            map.put("id", String.valueOf(i));
            map.put("name", "张三");
            map.put("age", String.valueOf(Math.random()));
            list.add(map);
        }
        //添加BOM头，解决中文乱码
        bos.write(new byte[] { (byte) 0xEF, (byte) 0xBB,(byte) 0xBF }); 
        //bos.write(b);
        //写表格头
        for(String title: titles) {
            bos.write(title.getBytes("UTF-8"));
            bos.write(",".getBytes("UTF-8"));
        }
        bos.write("
".getBytes("UTF-8"));
        //写 表格体
        for(Map<String,String> line: list) {
            bos.write(line.get("id").getBytes("UTF-8"));
            bos.write(",".getBytes("UTF-8"));
            bos.write(line.get("name").getBytes("UTF-8"));
            bos.write(",".getBytes("UTF-8"));
            bos.write(line.get("age").getBytes("UTF-8"));
            bos.write(",".getBytes("UTF-8"));
            bos.write("
".getBytes("UTF-8"));
        }
        os.flush();
        bos.close();
        os.close();

    }
    
    //PrintWriter
    @GetMapping("/csv2")
    public void csv2(HttpServletResponse resp) throws IOException {
        resp.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
        resp.setHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode(Math.random()+".csv", "iso8859-1"));
        resp.setCharacterEncoding("UTF-8");
        PrintWriter output = resp.getWriter();
        String[] titles = new String[]{"id","name","age"};
        List<Map<String,String>> list = new ArrayList<>();
        for(int i=0;i<10;i++) {
            Map<String,String> map = new HashMap<>();
            map.put("id", String.valueOf(i));
            map.put("name", "张三");
            map.put("age", String.valueOf(Math.random()));
            list.add(map);
        }
        //添加BOM头，解决中文乱码
        String bom = new String(new byte[] { (byte) 0xEF, (byte) 0xBB,(byte) 0xBF });
        output.print(bom);
        //写表格头
        for(String title: titles) {
            output.print(title);
            output.print(",");
        }
        output.println("");
        //写 表格体
        for(Map<String,String> line: list) {
            output.print(line.get("id"));
            output.print(",");
            output.print(line.get("name"));
            output.print(",");
            output.print(line.get("age"));
            output.println(",");
        }
        output.flush();
        output.close();
    }
}