【错误】--- An invalid character [32] was present in the Cookie value

 

1.分析错误，这个错误是由于后台

response.addCookie(cookie);

时报的错；是由于转化后的json字符中存在特殊字符，32为ascii码，此时你可以去看tomcat启动日志可能会出现如下警告

[http-nio-8080-exec-5] org.apache.tomcat.util.http.parser.Cookie.logInvalidHeader A cookie header was received [XX] that contained an invalid cookie. That cookie will be ignored.Note: further occurrences of this error will be logged at DEBUG level.

那么现在解决问题是，首先需要将对象转化为json，可以使用

ObjectMapper om = new ObjectMapper();

例如：

 public class TestJson {
 
     @Test
     public void testAdd() throws Exception {
         TestTb testTb = new TestTb();
         testTb.setName("derry");
         ObjectMapper om = new ObjectMapper();
         om.setSerializationInclusion(Include.NON_NULL);
         //将对象转换成json字符串
         Writer wr = new StringWriter();
         om.writeValue(wr, testTb);
         System.out.println(wr.toString());
         //转回对象
         TestTb r = om.readValue(wr.toString(), TestTb.class);
         System.out.println(r.toString());7     
    }
     
}

2.如果还继续报错，可能是由于cookie的版本较低，可以选择升级pom依赖，建议如下

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>

3.如果还继续报错，Tomcat启动的那个错误，可以修改tomcat的context.xml文件，在最后</context>前加如下

<CookieProcessor className ="org.apache.tomcat.util.http.LegacyCookieProcessor"/>

4.具体加的原因可以参考：http://www.mamicode.com/info-detail-2018600.html