还原问题:
request.setCharacterEncoding("UTF-8"); response.setContentType("text/html;charset=UTF-8"); request.setCharacterEncoding("UTF-8");
response.getOutputStream().println("中文");
java.io.CharConversionException: Not an ISO 8859-1 character: 中 at javax.servlet.ServletOutputStream.print(ServletOutputStream.java:89) at javax.servlet.ServletOutputStream.println(ServletOutputStream.java:242) at com.zwly.server.TanksServlet.doPost(TanksServlet.java:71) at com.zwly.server.TanksServlet.doGet(TanksServlet.java:24) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Unknown Source)
解决：
PrintWriter out = response.getWriter(); out.print("中文");
