PrintWriter 乱码问题

response.setContentType("application/json; charset=UTF-8");
PrintWriter out = response.getWriter();

此处需要注意 setContentType() 必须写在response.getWriter() 之前才起作用；

2、检查tomcat 中server.xml 中配置

 <Connector <span style="color:#FF0000;">URIEncoding="utf-8" useBodyEncodingForURI='true</span>' connectionTimeout="20000" port="8300" protocol="HTTP/1.1" redirectPort="8444"/>

URIEncoding是修改tomcat 编码 useBodyEncodingForURI是为了GET与POST的编码一致