Java 在Struts中将JSON字符串写入Printwriter时发生ArrayIndexOutOfBoundsException
我正在从数据库中获取一个Java 在Struts中将JSON字符串写入Printwriter时发生ArrayIndexOutOfBoundsException,java,json,http-headers,httpresponse,struts-1,Java,Json,Http Headers,Httpresponse,Struts 1,我正在从数据库中获取一个行列表,并将其转换为JSONstring,然后将其写入printwriter,以JSON格式发送输出 我能够写一些行,直到现在,它在下面代码中指出的行中给了我ArrayIndexOutOfBoundsException Gson gson = new Gson(); String jsonString = gson.toJson(subAreaCriteriaList); response.setHeader("X-JSON", jsonString); PrintWr
行列表
,并将其转换为JSONstring
,然后将其写入printwriter
,以JSON格式发送输出
我能够写一些行,直到现在,它在下面代码中指出的行中给了我ArrayIndexOutOfBoundsException
Gson gson = new Gson();
String jsonString = gson.toJson(subAreaCriteriaList);
response.setHeader("X-JSON", jsonString);
PrintWriter writer = response.getWriter();
writer = response.getWriter();
writer.write(jsonString);//exception at this line
writer.flush();
这是我的行动方法
public Object doGetSubAreasifExist(BaseActionMapping mapping,
ActionForm form, HttpServletRequest request,
HttpServletResponse response) throws Exception {
try {
CurrentRoute route = new CurrentRoute();
String areaID = request.getParameter("areaID");
LoginService bbcService = (LoginService) Context.getInstance()
.getBean("LoginService");
DetachedCriteria subAreaCriteria = DetachedCriteria.forClass(CabArea.class);
subAreaCriteria.add(Restrictions.ne(CabArea.PROP_ID, Long.parseLong(areaID)));
List<CabArea> subAreaCriteriaList = bbcService.findAll(subAreaCriteria);
Gson gson = new Gson();
String jsonString = gson.toJson(subAreaCriteriaList);
response.setHeader("X-JSON", jsonString);
PrintWriter writer = response.getWriter();
writer = response.getWriter();
writer.write(jsonString);
writer.flush();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
根据您添加的注释,我可以发送一定数量的数据,但当我超过它时,会出现错误,似乎标头大小(在您的情况下是
response.setHeader(“X-JSON”,jsonString);
)超过了最大限制(请参阅可能会有所帮助),并且问题似乎与服务器有关
如果您使用的是ApacheTomcat,那么可以参考modifyconf/server.xml。在server.xml中设置maxHttpHeaderSize将解决您的问题。下面是一个用于maxHttpHeaderSize使用的文件
您还必须关闭writer
对象,如下所示:
writer.flush();
writer.close();
如果您使用的是struts2.x,那么您可以使用struts对JSON的内置支持,请参阅@VisruthCV,我已经指出了行号处的异常OUCCRRING。错误与发送回的响应无关,而是在方法内部引发的。它与struts版本无关。我可以发送一定数量的数据,但当我超过它时,会出现错误。它似乎是struts1.x。你能在
jsonString
(生成此异常的那一个)中发布内容吗。实际上,没有必要在头中写入以发送回json响应。我已经更改了response.setHeader行(“X-JSON”,jsonString);setHeader(“X-JSON”,“test”);现在它可以正常工作了。Thanx@Visruth CV
java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at org.apache.coyote.http11.InternalOutputBuffer.write(InternalOutputBuffer.java:701)
at org.apache.coyote.http11.InternalOutputBuffer.sendStatus(InternalOutputBuffer.java:438)
at org.apache.coyote.http11.Http11Processor.prepareResponse(Http11Processor.java:1626)
at org.apache.coyote.http11.Http11Processor.action(Http11Processor.java:958)
at org.apache.coyote.Response.action(Response.java:183)
at org.apache.coyote.Response.sendHeaders(Response.java:379)
at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:314)
at org.apache.catalina.connector.OutputBuffer.close(OutputBuffer.java:274)
at org.apache.catalina.connector.Response.finishResponse(Response.java:493)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:317)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
writer.flush();
writer.close();