HttpServletResponse輸出亂碼的問題

HttpServletResponse的字節流:response.getOutputStream().write()

中文亂碼解決:

//經過Content-Type響應頭,通知瀏覽器以何種編碼格式打開內容
response.setHeader("Content-Type", "text/html;charset=UTF-8");
String data = "中國";
OutputStream out = response.getOutputStream();
//先後格式要統一,getBytes()不指定編碼格式時使用平臺默認編碼格式
out.write(data.getBytes("UTF-8"));

能夠回寫<meta>標籤來控制瀏覽器解析行爲

String data = "中國";
OutputStream out = response.getOutputStream();

String meta = "<meta http-equiv='content-type' content='text/html;charset=UTF-8' />":
out.write(meta.getBtyes());
out.write(data.getBytes("UTF-8"));

數字亂碼:

//經過Content-Type響應頭,指定響應內容格式及所採用的編碼格式
response.setHeader("Content-Type", "text/html;charset=UTF-8");
String data = "中國";
OutputStream out = response.getOutputStream();
//輸出數字:要先把數字轉爲字符串再getBytes(),不然瀏覽器會將原數字按指定碼錶解析出其它內容,而不會輸出原數字
out.write((3 + "").getBtyes());

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

//指定響應以UTF-8格式編碼內容
response.setCharacterEncoding("UTF-8");
//通知瀏覽器以何種編碼格式打開內容
response.setHeader("Content-Type", "text/html;charset=UTF-8");
//或response.setContentType("text/html;charset=UTF-8");
String data = "中國";
OutputStream out = response.getWriter();
out.write(data);

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

不可同時調用getOutputStream()及getWriter()方法,不然將會報錯:java.lang.IllegalStateException