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getWriter() has already been called for this response异常

IllegalStateException: getWriter() has already been called for this response
从字面意思不难得出错误原因:HttpServletResponse中的PrintWriter已经被手动调用过了。所以当servlet执行到方法结果处理逻辑时,需要将返回值输出到writer中去,这时发现PrintWriter已经被调用过。于是servlet认为这是使用混乱的逻辑错误,于是抛出错误。
根本原因:在Controller接口方法中,既手动调用PrintWriter向客户端输出内容,又设置了方法返回值。导致servlet需要两次将结果通过PrintWriter输出到客户端,结果报错。
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版权所有:《电光石火》 => getWriter() has already been called for this response异常
本文地址:http://www.ilkhome.cn/?post=463
欢迎转载!请注明,文章均为 《电光石火》 原创,并注明本文地址,谢谢。


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