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比方说,当URL包含有效的JSON时,我需要使用RestTemplate作为GET请求。一个例子URL是:当URL包含JSON时处理RestTemplate的模式匹配
http://example.com/?json={"property1":{"property2":0},"property3":{"property4":0.0,"property5":0.0}}
的代码:
String url = "http://example.com/?json={\"property1\":{\"property2\":0},\"property3\":{\"property4\":0.0,\"property5\":0.0}}";
RestTemplate template = new RestTemplate();
ResponseEntity<String> response = template.getForEntity(url, String.class);
除外:
Exception in thread "main" java.util.regex.PatternSyntaxException: Illegal repetition near index 32
\Qhttp://example.com/?json=\E({"property2":0)\Q,"property3":\E(0.0,"property5":0.0)\Q}\E
^
at java.util.regex.Pattern.error(Pattern.java:1955)
at java.util.regex.Pattern.closure(Pattern.java:3157)
at java.util.regex.Pattern.sequence(Pattern.java:2134)
at java.util.regex.Pattern.expr(Pattern.java:1996)
at java.util.regex.Pattern.group0(Pattern.java:2905)
at java.util.regex.Pattern.sequence(Pattern.java:2051)
at java.util.regex.Pattern.expr(Pattern.java:1996)
at java.util.regex.Pattern.compile(Pattern.java:1696)
at java.util.regex.Pattern.<init>(Pattern.java:1351)
at java.util.regex.Pattern.compile(Pattern.java:1028)
at org.springframework.web.util.UriTemplate$Parser.getMatchPattern(UriTemplate.java:247)
at org.springframework.web.util.UriTemplate$Parser.access$200(UriTemplate.java:196)
at org.springframework.web.util.UriTemplate.<init>(UriTemplate.java:70)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:471)
at org.springframework.web.client.RestTemplate.getForEntity(RestTemplate.java:260)
RestTemplate被引用的URL到JSON的开始,而不是整个URL 。从实验中,我知道花括号是问题所在。但是,使用反斜杠转义它们并不能解决问题。下面的代码产生“未封闭组”异常:
String url = "http://example.com/?json=\\{\"property1\":\\{\"property2\":0\\}\\}";
RestTemplate template = new RestTemplate();
ResponseEntity<String> response = template.getForEntity(url, String.class);
例外:
Exception in thread "main" java.util.regex.PatternSyntaxException: Unclosed group near index 56
\Qhttp://example.com/?json=\\E(\{"property2":0\)\Q\}\E
^
at java.util.regex.Pattern.error(Pattern.java:1955)
at java.util.regex.Pattern.accept(Pattern.java:1813)
at java.util.regex.Pattern.group0(Pattern.java:2908)
at java.util.regex.Pattern.sequence(Pattern.java:2051)
at java.util.regex.Pattern.expr(Pattern.java:1996)
at java.util.regex.Pattern.compile(Pattern.java:1696)
at java.util.regex.Pattern.<init>(Pattern.java:1351)
at java.util.regex.Pattern.compile(Pattern.java:1028)
at org.springframework.web.util.UriTemplate$Parser.getMatchPattern(UriTemplate.java:247)
at org.springframework.web.util.UriTemplate$Parser.access$200(UriTemplate.java:196)
at org.springframework.web.util.UriTemplate.<init>(UriTemplate.java:70)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:471)
at org.springframework.web.client.RestTemplate.getForEntity(RestTemplate.java:260)
at com.ebay.sdo.misc.ThemisTest.main(ThemisTest.java:55)
我怎样才能让RestTemplate正确引用网址是什么?
为什么你需要纳入'json' url中,如果它是一个'GET'要求? – NiVeR
不幸的是,API就是这么设计的...... – Ozilophile
正如David S.指出的那样,URL编码是关键。然而,质疑API设计。另请注意,浏览器/服务器确实有字符限制。使用POST方法的请求体将更有意义 – Hirako