前言

在开发过程中如有此业务需求，那么本文或许能给你派上用场。

工具类

/* 导出txt文件
 * @author    
 * @param    response
 * @param    text 导出的字符串
 * @return
 */
public void exportTxt(HttpServletResponse response,String text){
    response.setCharacterEncoding("utf-8");
//        设置响应的内容类型
    response.setContentType("text/plain");
//        设置文件的名称和格式
      response.addHeader("Content-Disposition", "attachment;filename="+genAttachmentFileName("文件名称", "JSON_FOR_UCC_")+".txt");//设置名称格式，没有这个中文名称无法显示
      BufferedOutputStream buff = null;
      ServletOutputStream outStr = null;
     try {
        outStr = response.getOutputStream();
        buff = new BufferedOutputStream(outStr);
        buff.write(text.getBytes("UTF-8"));
        buff.flush();
        buff.close();
     } catch (Exception e) {
                      System.out.println("导出文件文件出错");
     }finally {
        try {
            buff.close();
            outStr.close();
        } catch (Exception e) {
            System.out.println("关闭流对象出错");
        }
    }
}

/**
 * 防止中文文件名显示出错
 * 
 * @param cnName
 * @param defaultName
 * @return
 */
public String genAttachmentFileName(String cnName, String defaultName){
    try {
        cnName = new String(cnName.getBytes("gb2312"), "ISO8859-1");
    } catch (Exception e) {
        cnName = defaultName;
    }
    return cnName;
}

使用

/* 
 * 将查询的结果作为导出结果
 * @author    
 * @param
 * @return
 */
@RequestMapping("exportLog.do")
public void exportLog(HttpServletResponse response,MchRebateListForm fom){
    //获取日志
    fom.setPageNumber(0);
    fom.setPageSize(30000);//最大数量
    List<MchHelpReturnCommission> list = mchRebateService.list_MchHelpRebate(fom);
    
    
    //拼接字符串
    StringBuffer text = new StringBuffer();
    for(MchHelpReturnCommission log:list){
        text.append(log.getMydata());
        text.append("\r\n");//换行字符
    }
    exportTxt(response,text.toString());
    
}