This is a command I made for a woodman spawner in vanilla minecraft 1.12.
Hopefully you find it useful and entertaining in your minecraft adventures.

/setblock ~ ~1 ~ minecraft:mob_spawner 0 replace {RequiredPlayerRange:5,SpawnData:{id:"minecraft:zombie",IsVillager:0,IsBaby:0,ArmorItems:[{id:"minecraft:leather_boots",Count:1b},{id:"minecraft:leather_leggings",Count:1b},{id:"minecraft:leather_chestplate",Count:1b},{id:"minecraft:planks",Count:1b}],HandItems:[{id:"minecraft:wooden_sword",Count:1b,tag:{HideFlags:4,Unbreakable:1}},{id:"minecraft:shield",Count:1b,tag:{Unbreakable:1,BlockEntityTag:{Base:15,Patterns:{Pattern:bo,Color:3},{Pattern:flo,Color:14},{Pattern:sku,Color:3},{Pattern:mr,Color:3}]}}}],ArmorDropChances:[0.085F,2.0F,2.0F,0.0F],HandDropChances:[0.8F,0.9F]},SpawnPotentials:[{Weight:1,Entity:{id:"minecraft:zombie",IsVillager:0,IsBaby:0,ArmorItems:{id:"minecraft:leather_boots",Count:1b},{id:"minecraft:leather_leggings",Count:1b},{id:"minecraft:leather_chestplate",Count:1b},{id:"minecraft:planks",Count:1b}],HandItems:[{id:"minecraft:wooden_sword",Count:1b,tag:{HideFlags:4,Unbreakable:1}},{id:"minecraft:shield",Count:1b,tag:{Unbreakable:1,BlockEntityTag:{Base:15,Patterns:{Pattern:bo,Color:3},{Pattern:flo,Color:14},{Pattern:sku,Color:3},{Pattern:mr,Color:3}]}}}],ArmorDropChances:[0.085F,2.0F,2.0F,0.0F],HandDropChances:[0.8F,0.9F]}},{Weight:1,Entity:{id:"minecraft:zombie",IsVillager:0,IsBaby:0,ArmorItems:[{id:"minecraft:leather_boots",Count:1b},{id:"minecraft:leather_leggings",Count:1b},{id:"minecraft:leather_chestplate",Count:1b},{id:"minecraft:planks",Damage:1,Count:1b}],HandItems:[{id:"minecraft:wooden_sword",Count:1b,tag:{HideFlags:4,Unbreakable:1}},{id:"minecraft:shield",Count:1b,tag:{Unbreakable:1,BlockEntityTag:{Base:15,Patterns:{Pattern:bo,Color:3},{Pattern:flo,Color:14},{Pattern:sku,Color:3},{Pattern:mr,Color:3}]}}}],ArmorDropChances:[0.085F,2.0F,2.0F,0.0F],HandDropChances:[0.8F,0.9F]}},{Weight:1,Entity:{id:"minecraft:zombie",IsVillager:0,IsBaby:0,ArmorItems:[{id:"minecraft:leather_boots",Count:1b},{id:"minecraft:leather_leggings",Count:1b},{id:"minecraft:leather_chestplate",Count:1b},{id:"minecraft:planks",Damage:2,Count:1b}],HandItems:[{id:"minecraft:wooden_sword",Count:1b,tag:{HideFlags:4,Unbreakable:1}},{id:"minecraft:shield",Count:1b,tag:{Unbreakable:1,BlockEntityTag:{Base:15,Patterns:{Pattern:bo,Color:3},{Pattern:flo,Color:14},{Pattern:sku,Color:3},{Pattern:mr,Color:3}]}}}],ArmorDropChances:[0.085F,2.0F,2.0F,0.0F],HandDropChances:[0.8F,0.9F]}},{Weight:1,Entity:{id:"minecraft:zombie",IsVillager:0,IsBaby:0,ArmorItems:[{id:"minecraft:leather_boots",Count:1b},{id:"minecraft:leather_leggings",Count:1b},{id:"minecraft:leather_chestplate",Count:1b},{id:"minecraft:planks",Damage:3,Count:1b}],HandItems:[{id:"minecraft:wooden_sword",Count:1b,tag:{HideFlags:4,Unbreakable:1}},{id:"minecraft:shield",Count:1b,tag:{Unbreakable:1,BlockEntityTag:{Base:15,Patterns:{Pattern:bo,Color:3},{Pattern:flo,Color:14},{Pattern:sku,Color:3},{Pattern:mr,Color:3}]}}}],ArmorDropChances:[0.085F,2.0F,2.0F,0.0F],HandDropChances:[0.8F,0.9F]}},{Weight:1,Entity:{id:"minecraft:zombie",IsVillager:0,IsBaby:0,ArmorItems:[{id:"minecraft:leather_boots",Count:1b},{id:"minecraft:leather_leggings",Count:1b},{id:"minecraft:leather_chestplate",Count:1b},{id:"minecraft:planks",Damage:4,Count:1b}],HandItems:[{id:"minecraft:wooden_sword",Count:1b,tag:{HideFlags:4,Unbreakable:1}},{id:"minecraft:shield",Count:1b,tag:{Unbreakable:1,BlockEntityTag:{Base:15,Patterns:{Pattern:bo,Color:3},{Pattern:flo,Color:14},{Pattern:sku,Color:3},{Pattern:mr,Color:3}]}}}],ArmorDropChances:[0.085F,2.0F,2.0F,0.0F],HandDropChances:[0.8F,0.9F]}},{Weight:1,Entity:{id:"minecraft:zombie",IsVillager:0,IsBaby:0,ArmorItems:[{id:"minecraft:leather_boots",Count:1b},{id:"minecraft:leather_leggings",Count:1b},{id:"minecraft:leather_chestplate",Count:1b},{id:"minecraft:planks",Damage:5,Count:1b}],HandItems:[{id:"minecraft:wooden_sword",Count:1b,tag:{HideFlags:4,Unbreakable:1}},{id:"minecraft:shield",Count:1b,tag:{Unbreakable:1,BlockEntityTag:{Base:15,Patterns:{Pattern:bo,Color:3},{Pattern:flo,Color:14},{Pattern:sku,Color:3},{Pattern:mr,Color:3}]}}}],ArmorDropChances:[0.085F,2.0F,2.0F,0.0F],HandDropChances:[0.8F,0.9F]}}]}