grails文件下载

 1.后台controller代码

/**
    * 文件下载
    */
  def fileDownload = {
    def filePath = params.filePath  //文件路径
    def fileName = encode(params.fileName)  //文件名
    response.setHeader("Content-disposition", "attachment; filename=" + fileName)
    response.contentType = "application/x-rarx-rar-compressed"
    def out = response.outputStream
    def inputStream = new FileInputStream(filePath)
    byte[] buffer = new byte[1024]
    int i = -1
    while ((i = inputStream.read(buffer)) != -1) {
        out.write(buffer, 0, i)
    }
    out.flush()
    out.close()
    inputStream.close()
  }

  /**
   * 字符编码
   */
   final def encode(String value,String charSet='UTF-8'){
       java.net.URLEncoder.encode(value, charSet)
   }

 

2.前端gsp

/**
 *下载
 */
 function download(m,f){
  //检查文件是否存在
  var checkurl ="${contextPath}/fileUpload/checkFileExists?filePath="+encodeURIComponent(f);
  j.ajax({
   url:checkurl,
   async:false,
   success:function (dt) {
    json = eval('('+dt+')');
    if(json.success){
     var url= "${contextPath}/fileUpload/fileDownload?filePath="+encodeURIComponent(f)+"&fileName="+encodeURIComponent(m);
     window.open(url);
     return false;
    }else{
     alert(json.msg);
    }
   }
  });
 }