HttpServletResponse的字节流:response.getOutputStream().write()

//通过Content-Type响应头,通知浏览器以何种编码格式打开内容response.setHeader("Content-Type", "text/html;charset=UTF-8");String data = "中国";OutputStream out = response.getOutputStream();//前后格式要统一,getBytes()不指定编码格式时使用平台默认编码格式out.write(data.getBytes("UTF-8"));

String data = "中国";OutputStream out = response.getOutputStream();String meta = "
    ":out.write(meta.getBtyes());out.write(data.getBytes("UTF-8"));

数字乱码:

//通过Content-Type响应头,指定响应内容格式及所采用的编码格式response.setHeader("Content-Type", "text/html;charset=UTF-8");String data = "中国";OutputStream out = response.getOutputStream();//输出数字:要先把数字转为字符串再getBytes(),否则浏览器会将原数字按指定码表解析出其它内容,而不会输出原数字out.write((3 + "").getBtyes());

HttpServletResponse的字符流:response.getWriter().write()

//指定响应以UTF-8格式编码内容response.setCharacterEncoding("UTF-8");//通知浏览器以何种编码格式打开内容response.setHeader("Content-Type", "text/html;charset=UTF-8");//或response.setContentType("text/html;charset=UTF-8");String data = "中国";OutputStream out = response.getWriter();out.write(data);

//response.setContentType("text/html;charset=UTF-8")//效果等价于setCharacterEncoding("UTF-8")及setHeader("Content-Type","text/html;charset=UTF-8")response.setContentType("text/html;charset=UTF-8");String data = "中国";OutputStream out = response.getWriter();out.write(data);

不可同时调用getOutputStream()及getWriter()方法,否则将会报错:java.lang.IllegalStateException