如果您要创建或读取json字符串，则建议使用Google的Gson。
要从Servlet发送json响应，请执行以下操作：
response.setContentType("application/json");
response.setCharacterEncoding("UTF-8");
PrintWriter writer = null;
try {
writer = response.getWriter();
writer.write(json);
} finally {
writer.close();
}
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