springMVC 文件下载

用到的jar包：

import org.apache.commons.io.FileUtils;  
import org.springframework.context.annotation.Scope;  
import org.springframework.http.HttpHeaders;  
import org.springframework.http.HttpStatus;  
import org.springframework.http.MediaType;  
import org.springframework.http.ResponseEntity;  
import org.springframework.stereotype.Component;  
import org.springframework.web.bind.annotation.RequestMapping;  

控制层下载方法：

@Value("${file.excelFilePath}")
private String excelFilePath; //文件路径，写在.properties后缀文件中，file.excelFilePath为key值
private final static String fileName = "Excel文件名";

@RequestMapping(value = "/dataMonitordownload")
public ResponseEntity<byte[]> dataMonitor() throws IOException {
	//
	String[] paths = new File(excelFilePath).list();
	String fileExcel = "";
	for (String path : paths) {
		if (path.equals(fileName+".xlsx") || path.equals(fileName+".xls")) {
			fileExcel = path;
			break;
		}
	}
	//文件
	File file = new File(excelFilePath + "/" + fileExcel);
	//下面开始设置HttpHeaders,使得浏览器响应下载
	HttpHeaders headers = new HttpHeaders();
	//设置响应方式
	headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
	//设置响应文件 和编码，防止乱码
	headers.setContentDispositionFormData("attachment", URLEncoder.encode(file.getName(), "UTF-8"));
	//把文件以二进制形式写回
	return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.OK);
}

前台页面方法：

function dataMonitorOperateDownload(){
	postDownload("<%=request.getContextPath()%>/fileOperate/dataMonitordownload");
}

function postDownload(URL) {
	var temp = document.createElement('form');
	temp.action = URL;
	temp.method = 'post';
	temp.style.display = 'none';
	document.body.appendChild(temp);
	temp.submit();
	return temp;
}