java 快捷操作Properties 辅助类

我们在操作Properties 时候一般都是按照键值来操作，但是如果我们在操作一个复杂 的Properties 时候这样先进行很多操作就显得累赘。比如我们想获取Spring Boot 的 Properties 时候。里面很多复杂的键。我们就需要考虑找一个工具类来实现。

package com.yoke.util; import java.util.ArrayList; import java.util.Enumeration; import java.util.HashSet; import java.util.Properties; import java.util.StringTokenizer; /** * */ public class PropertiesParser { Properties props = null; public PropertiesParser(Properties props) { this.props = props; } public Properties getUnderlyingProperties() { return this.props; } public String getStringProperty(String name) { return this.getStringProperty(name, (String)null); } public String getStringProperty(String name, String def) { String val = this.props.getProperty(name, def); if(val == null) { return def; } else { val = val.trim(); return val.length() == 0?def:val; } } public String[] getStringArrayProperty(String name) { return this.getStringArrayProperty(name, (String[])null); } public String[] getStringArrayProperty(String name, String[] def) { String vals = this.getStringProperty(name); if(vals == null) { return def; } else { StringTokenizer stok = new StringTokenizer(vals, ","); ArrayList strs = new ArrayList(); try { while(stok.hasMoreTokens()) { strs.add(stok.nextToken().trim()); } return (String[])((String[])strs.toArray(new String[strs.size()])); } catch (Exception var7) { return def; } } } public boolean getBooleanProperty(String name) { return this.getBooleanProperty(name, false); } public boolean getBooleanProperty(String name, boolean def) { String val = this.getStringProperty(name); return val == null?def:Boolean.valueOf(val).booleanValue(); } public byte getByteProperty(String name) throws NumberFormatException { String val = this.getStringProperty(name); if(val == null) { throw new NumberFormatException(" null string"); } else { try { return Byte.parseByte(val); } catch (NumberFormatException var4) { throw new NumberFormatException(" \'" + val + "\'"); } } } public byte getByteProperty(String name, byte def) throws NumberFormatException { String val = this.getStringProperty(name); if(val == null) { return def; } else { try { return Byte.parseByte(val); } catch (NumberFormatException var5) { throw new NumberFormatException(" \'" + val + "\'"); } } } public char getCharProperty(String name) { return this.getCharProperty(name, '\u0000'); } public char getCharProperty(String name, char def) { String param = this.getStringProperty(name); return param == null?def:param.charAt(0); } public double getDoubleProperty(String name) throws NumberFormatException { String val = this.getStringProperty(name); if(val == null) { throw new NumberFormatException(" null string"); } else { try { return Double.parseDouble(val); } catch (NumberFormatException var4) { throw new NumberFormatException(" \'" + val + "\'"); } } } public double getDoubleProperty(String name, double def) throws NumberFormatException { String val = this.getStringProperty(name); if(val == null) { return def; } else { try { return Double.parseDouble(val); } catch (NumberFormatException var6) { throw new NumberFormatException(" \'" + val + "\'"); } } } public float getFloatProperty(String name) throws NumberFormatException { String val = this.getStringProperty(name); if(val == null) { throw new NumberFormatException(" null string"); } else { try { return Float.parseFloat(val); } catch (NumberFormatException var4) { throw new NumberFormatException(" \'" + val + "\'"); } } } public float getFloatProperty(String name, float def) throws NumberFormatException { String val = this.getStringProperty(name); if(val == null) { return def; } else { try { return Float.parseFloat(val); } catch (NumberFormatException var5) { throw new NumberFormatException(" \'" + val + "\'"); } } } public int getIntProperty(String name) throws NumberFormatException { String val = this.getStringProperty(name); if(val == null) { throw new NumberFormatException(" null string"); } else { try { return Integer.parseInt(val); } catch (NumberFormatException var4) { throw new NumberFormatException(" \'" + val + "\'"); } } } public int getIntProperty(String name, int def) throws NumberFormatException { String val = this.getStringProperty(name); if(val == null) { return def; } else { try { return Integer.parseInt(val); } catch (NumberFormatException var5) { throw new NumberFormatException(" \'" + val + "\'"); } } } public int[] getIntArrayProperty(String name) throws NumberFormatException { return this.getIntArrayProperty(name, (int[])null); } public int[] getIntArrayProperty(String name, int[] def) throws NumberFormatException { String vals = this.getStringProperty(name); if(vals == null) { return def; } else { StringTokenizer stok = new StringTokenizer(vals, ","); ArrayList ints = new ArrayList(); try { while(stok.hasMoreTokens()) { try { ints.add(new Integer(stok.nextToken().trim())); } catch (NumberFormatException var8) { throw new NumberFormatException(" \'" + vals + "\'"); } } int[] e = new int[ints.size()]; for(int i = 0; i < ints.size(); ++i) { e[i] = ((Integer)ints.get(i)).intValue(); } return e; } catch (Exception var9) { return def; } } } public long getLongProperty(String name) throws NumberFormatException { String val = this.getStringProperty(name); if(val == null) { throw new NumberFormatException(" null string"); } else { try { return Long.parseLong(val); } catch (NumberFormatException var4) { throw new NumberFormatException(" \'" + val + "\'"); } } } public long getLongProperty(String name, long def) throws NumberFormatException { String val = this.getStringProperty(name); if(val == null) { return def; } else { try { return Long.parseLong(val); } catch (NumberFormatException var6) { throw new NumberFormatException(" \'" + val + "\'"); } } } public short getShortProperty(String name) throws NumberFormatException { String val = this.getStringProperty(name); if(val == null) { throw new NumberFormatException(" null string"); } else { try { return Short.parseShort(val); } catch (NumberFormatException var4) { throw new NumberFormatException(" \'" + val + "\'"); } } } public short getShortProperty(String name, short def) throws NumberFormatException { String val = this.getStringProperty(name); if(val == null) { return def; } else { try { return Short.parseShort(val); } catch (NumberFormatException var5) { throw new NumberFormatException(" \'" + val + "\'"); } } } public String[] getPropertyGroups(String prefix) { Enumeration keys = this.props.propertyNames(); HashSet groups = new HashSet(10); if(!prefix.endsWith(".")) { prefix = prefix + "."; } while(keys.hasMoreElements()) { String key = (String)keys.nextElement(); if(key.startsWith(prefix)) { String groupName = key.substring(prefix.length(), key.indexOf(46, prefix.length())); groups.add(groupName); } } return (String[])((String[])groups.toArray(new String[groups.size()])); } public Properties getPropertyGroup(String prefix) { return this.getPropertyGroup(prefix, false, (String[])null); } public Properties getPropertyGroup(String prefix, boolean stripPrefix) { return this.getPropertyGroup(prefix, stripPrefix, (String[])null); } public Properties getPropertyGroup(String prefix, boolean stripPrefix, String[] excludedPrefixes) { Enumeration keys = this.props.propertyNames(); Properties group = new Properties(); if(!prefix.endsWith(".")) { prefix = prefix + "."; } while(true) { String key; do { if(!keys.hasMoreElements()) { return group; } key = (String)keys.nextElement(); } while(!key.startsWith(prefix)); boolean exclude = false; if(excludedPrefixes != null) { for(int value = 0; value < excludedPrefixes.length && !exclude; ++value) { exclude = key.startsWith(excludedPrefixes[value]); } } if(!exclude) { String var9 = this.getStringProperty(key, ""); if(stripPrefix) { group.put(key.substring(prefix.length()), var9); } else { group.put(key, var9); } } } } }

这个类来源于jsoup ，主要是对类似于SpringBoot 复杂的键来进行分组管理。