java實作導出excel文件

	4.0.0
	
		org.springframework.boot
		spring-boot-starter-parent
		2.2.6.RELEASE
		 
	
	com.briup
	demo3
	0.0.1-SNAPSHOT
	war
	demo3
	Demo project for Spring Boot

	
		1.8
	

	
		
			org.springframework.boot
			spring-boot-starter-web
		

		
			org.springframework.boot
			spring-boot-starter-tomcat
			provided
		
		
			org.springframework.boot
			spring-boot-starter-test
			test
			
				
					org.junit.vintage
					junit-vintage-engine
				
			
		
		
            org.apache.poi
            poi
            3.6
            
                
                    javax.servlet
                    servlet-api
                
                
                    log4j
                    log4j
                
            
        
	

	
		
			
				org.springframework.boot
				spring-boot-maven-plugin
			
		
	

public class User {
	
	private String username;
	private String email;
	private String createTime;
	private String LastLoginTime;
	private String roleName;
	private String enable;
	public User() {
		super();
	}
}

import java.util.List;

public interface UserService {
	public List findAllUser();
}

import java.util.List;

public class UserServiceImpl implements UserService {
	@Override
	public List findAllUser() {
		User user = new User();
		return null;
	}

}

import java.util.List;
import java.util.Map;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class ExcelUtil {
    public static HSSFWorkbook getHSSFWorkbook(String sheetName,String sheetName1,String sheetName2, String []title, String[]  content,String[] app){
    	 
        // 第一步，创建一个HSSFWorkbook，对应一个Excel文件
        HSSFWorkbook wb = new HSSFWorkbook();
 
        // 第二步，在workbook中添加一个sheet,对应Excel文件中的sheet
        HSSFSheet sheet = wb.createSheet(sheetName);
        HSSFSheet sheet1 = wb.createSheet(sheetName1);
        HSSFSheet sheet2 = wb.createSheet(sheetName2);
 
        // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制
        HSSFRow row = sheet.createRow(0);
        HSSFRow row1 = sheet1.createRow(0);
        HSSFRow row2 = sheet2.createRow(0);
 
        // 第四步，创建单元格样式，并设置值表头 设置表头居中
        HSSFCellStyle style = wb.createCellStyle();
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式
 
        //声明单元格
        HSSFCell cell = null;
 
        //创建标题
        for(int i=0;i 0){
        	for(int i=0;i 0){
        	for(int i=0;i 0){
        	for(int i=0;i
登入後複製

import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/MyTest")
public class HelloController {
    @ResponseBody
    @RequestMapping("/hello")
    public void export(@RequestBody(required = false) User user,String username,HttpServletResponse response) throws Exception {
    	
        if (user ==null && !StringUtils.isEmpty(username)){
            //GET 请求的参数
            user = new User();
            user.setUsername(username);
        }
        UserService userService = new UserServiceImpl();
		//获取数据
        List list = userService.findAllUser();
       
        //excel标题
        String[] title = {"姓名", "邮箱", "创建时间", "最近登录时间","角色","是否可用"};
 
        //excel文件名
        String fileName = System.currentTimeMillis() + ".xls";
 
        //sheet名
        String sheetName = "用户信息";
        String sheetName1 = "hello";
        String sheetName2 = "xixi";
 
        //没有数据就传入null吧，Excel工具类有对null判断
        String[] content= {"ali","aaa","ddd","aaa","aaa","aaaa"};
        String[] app= {"bbbb","bbbb","bbbb","bbbb","bbbb","bbbb",};
        if (list != null && list.size() > 0){
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            for (int i = 0; i < list.size(); i++) {
                User obj = list.get(i);
                
                content[1] = obj.getUsername();
                content[1] = obj.getEmail();
                content[2] = obj.getCreateTime() == null ? "" : sdf.format(obj.getCreateTime());
                content[3] = obj.getLastLoginTime() == null ? "": sdf.format(obj.getLastLoginTime());
                content[4] = obj.getRoleName();
            }
        }
        if (list != null && list.size() > 0){
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            for (int i = 0; i < list.size(); i++) {
                User obj = list.get(i);
                
                app[1] = obj.getUsername();
                app[1] = obj.getEmail();
                app[2] = obj.getCreateTime() == null ? "" : sdf.format(obj.getCreateTime());
                app[3] = obj.getLastLoginTime() == null ? "": sdf.format(obj.getLastLoginTime());
                app[4] = obj.getRoleName();
            }
        }
 
        //创建HSSFWorkbook
        HSSFWorkbook wb = ExcelUtil.getHSSFWorkbook(sheetName,sheetName1,sheetName2, title, content,app);
//        HSSFWorkbook wb1 = ExcelUtil.getHSSFWorkbook(sheetName1, title, content);
 
        //响应到客户端
        try {
            fileName = new String(fileName.getBytes(), "UTF-8");
            response.setContentType("application/vnd.ms-excel;charset=utf-8");
            response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
            OutputStream os = response.getOutputStream();
            wb.write(os);
            os.flush();
            os.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}