【工作】Guava开发必备代码库
JavaGuava
# Joiner & Splitter
// url路径参数解析
Map<String, String> join = Splitter.on("&").withKeyValueSeparator("=").split("id=1&name=lcs");
String split = Joiner.on("&").withKeyValueSeparator("=").join(join);
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// skipNulls会过滤掉空的参数，包括数组中的null值。
Joiner.on("|").skipNulls().join(stringList);
// usefornull会以参数替换空的参数，包括数组中的null值。
Joiner.on("|").useForNull("no value").join(stringList);
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// join参数可以很复杂
String result = Joiner.on("_").join("user_common_count", "name", new Object[]{"nick","adidas",10000})
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# MD5
public class HashUtils {
private static final HashFunction FUNCTION = Hashing.md5();
private static final String SALT = "abcd";
public static String encryPassword(String password){
HashCode hashCode = FUNCTION.hashString(password + SALT, Charset.forName("UTF-8"));
return hashCode.toString();
}
}
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# Cache
private final Cache<String, String> cache =
CacheBuilder.newBuilder().maximumSize(100).expireAfterAccess(15, TimeUnit.MINUTES)
.removalListener(new RemovalListener<String, String>() {
@Override
public void onRemoval(RemovalNotification<String, String> notification) {
...
}
}).build();
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# File
String text = CharStreams.toString(new InputStreamReader(new FileInputStream("d:/sample.txt"), "UTF-8"));
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