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报错java.lang.IllegalStateException: WRITER的解决方法
完整的报错信息 有2种,看调用先后顺序: Response.getOutputStream java.lang.IllegalStateException: WRITER Response.getWriter java.lang.IllegalStateException: STREAM 原因: HttpServletResponse的指针只能获取一次,如果同时(先后)调用getOutputStream()和getWriter()方java 使用post 请求x-www-form-urlencoded格式数据
代码如下: public String getMsg() { String result = ""; try { URL url = new URL("https://XXXX.cn/token"); //通过调用url.openConnection()来获得一个新的URLConnection对象,并且将其结果强制转换为HttpURLConnection. HttpURLConnectionJava中实现文件下载通用方式
文件下载只需要四步: 1.设置文件ContentType类型 response.setContentType("multipart/form-data"); 2.设置文件头 response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8")); 3.通过response获取ServletO下载文件
/** * 下载文件 * @param fileName * @param out */ public static void downloadTemplate(String fileName, HttpServletResponse response) { try { fileName = URLEncoder.encode(fileName, "UTF-8"); InputStream in = new ClassPathResource(CoJava Web报错:getOutputStream() has already been called for this response解决方案
今天做了个导出excel表的功能。大概代码如下: ouputStream = response.getOutputStream(); wb.write(ouputStream); ouputStream.flush(); ouputStream.close(); 1234发现报错 java.lang.IllegalStateException: getOutputStream() has already been called for this response1报一些安卓模拟器的IP问题和getOutputStream();关于connect();的函数异常的问题
ip问题 1.不能使用local host 和127.0.0.1作为本地服务器的地址,而网上无论10.0.0.2还是10.0.2.2的8080端口都无法访问。真正的地址应该在CMD 键入ipconfig 查到的IPv4地址,即本地地址创建URL getOutputStream函数的异常以及无法执行的问题 2.在安卓模拟器运行时,通过debug发文件下载后台报错IllegalStateException: getOutputStream() has already been called
java.lang.IllegalStateException: getOutputStream() has already been called 1 <%@page language="java" contentType="text/html; charset=UTF-8"%> 2 <%@page import="java.util.*,java.io.*"%> 3 <html> 4 <hea